Remove unnecessary null pointer tests to avoid a false Coverity FORWARD_NULL defect.
Remove unnecessary null pointer tests to avoid a false Coverity
FORWARD_NULL defect.

In the for loop, at most one buffer in the |buffers| array
is of type SECBUFFER_DATA and at most one is of type SECBUFFER_EXTRA.
The null pointer test for decrypted_ptr_ is not necessary because
when we encounter the only buffer of type SECBUFFER_DATA, decrypted_ptr_
must be NULL (the initial value).  I added a DCHECK to assert that.
Similarly the null pointer test for received_ptr_ is not necessary.

R=mattm
BUG=22286
CID=5331
TEST=one
Review URL: http://codereview.chromium.org/371014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@31499 0039d316-1c4b-4281-b951-d872f2087c98

hgl888/chromium-crosswalk-efl,ondra-novak/chromium.src,zcbenz/cefode-chromium,jaruba/chromium.src,chuan9/chromium-crosswalk,rogerwang/chromium,mohamed--abdel-maksoud/chromium.src,Pluto-tv/chromium-crosswalk,pozdnyakov/chromium-crosswalk,Jonekee/chromium.src,ltilve/chromium,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,ChromiumWebApps/chromium,pozdnyakov/chromium-crosswalk,M4sse/chromium.src,pozdnyakov/chromium-crosswalk,fujunwei/chromium-crosswalk,junmin-zhu/chromium-rivertrail,Just-D/chromium-1,anirudhSK/chromium,TheTypoMaster/chromium-crosswalk,dushu1203/chromium.src,zcbenz/cefode-chromium,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk,hgl888/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,mogoweb/chromium-crosswalk,nacl-webkit/chrome_deps,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,patrickm/chromium.src,chuan9/chromium-crosswalk,ChromiumWebApps/chromium,bright-sparks/chromium-spacewalk,rogerwang/chromium,dushu1203/chromium.src,Chilledheart/chromium,anirudhSK/chromium,jaruba/chromium.src,dushu1203/chromium.src,hgl888/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,pozdnyakov/chromium-crosswalk,timopulkkinen/BubbleFish,M4sse/chromium.src,ondra-novak/chromium.src,hujiajie/pa-chromium,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,dushu1203/chromium.src,Chilledheart/chromium,patrickm/chromium.src,patrickm/chromium.src,littlstar/chromium.src,bright-sparks/chromium-spacewalk,pozdnyakov/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,keishi/chromium,junmin-zhu/chromium-rivertrail,pozdnyakov/chromium-crosswalk,anirudhSK/chromium,M4sse/chromium.src,mogoweb/chromium-crosswalk,hujiajie/pa-chromium,jaruba/chromium.src,littlstar/chromium.src,Fireblend/chromium-crosswalk,timopulkkinen/BubbleFish,timopulkkinen/BubbleFish,pozdnyakov/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,mogoweb/chromium-crosswalk,ltilve/chromium,hgl888/chromium-crosswalk-efl,Just-D/chromium-1,fujunwei/chromium-crosswalk,Just-D/chromium-1,ltilve/chromium,dednal/chromium.src,axinging/chromium-crosswalk,markYoungH/chromium.src,axinging/chromium-crosswalk,keishi/chromium,anirudhSK/chromium,bright-sparks/chromium-spacewalk,PeterWangIntel/chromium-crosswalk,fujunwei/chromium-crosswalk,M4sse/chromium.src,dednal/chromium.src,krieger-od/nwjs_chromium.src,ondra-novak/chromium.src,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,ChromiumWebApps/chromium,Jonekee/chromium.src,junmin-zhu/chromium-rivertrail,crosswalk-project/chromium-crosswalk-efl,hujiajie/pa-chromium,patrickm/chromium.src,TheTypoMaster/chromium-crosswalk,patrickm/chromium.src,rogerwang/chromium,junmin-zhu/chromium-rivertrail,markYoungH/chromium.src,zcbenz/cefode-chromium,Pluto-tv/chromium-crosswalk,rogerwang/chromium,junmin-zhu/chromium-rivertrail,robclark/chromium,hujiajie/pa-chromium,ondra-novak/chromium.src,TheTypoMaster/chromium-crosswalk,robclark/chromium,markYoungH/chromium.src,keishi/chromium,Jonekee/chromium.src,patrickm/chromium.src,Chilledheart/chromium,ondra-novak/chromium.src,mogoweb/chromium-crosswalk,axinging/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,anirudhSK/chromium,zcbenz/cefode-chromium,littlstar/chromium.src,patrickm/chromium.src,hgl888/chromium-crosswalk,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,Pluto-tv/chromium-crosswalk,Jonekee/chromium.src,keishi/chromium,chuan9/chromium-crosswalk,pozdnyakov/chromium-crosswalk,patrickm/chromium.src,dednal/chromium.src,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,Fireblend/chromium-crosswalk,dednal/chromium.src,dushu1203/chromium.src,zcbenz/cefode-chromium,mogoweb/chromium-crosswalk,chuan9/chromium-crosswalk,ltilve/chromium,Just-D/chromium-1,M4sse/chromium.src,dednal/chromium.src,timopulkkinen/BubbleFish,axinging/chromium-crosswalk,zcbenz/cefode-chromium,hgl888/chromium-crosswalk,rogerwang/chromium,Pluto-tv/chromium-crosswalk,Chilledheart/chromium,dushu1203/chromium.src,hgl888/chromium-crosswalk,bright-sparks/chromium-spacewalk,timopulkkinen/BubbleFish,fujunwei/chromium-crosswalk,chuan9/chromium-crosswalk,M4sse/chromium.src,hujiajie/pa-chromium,rogerwang/chromium,Fireblend/chromium-crosswalk,jaruba/chromium.src,Just-D/chromium-1,Just-D/chromium-1,anirudhSK/chromium,Pluto-tv/chromium-crosswalk,littlstar/chromium.src,dushu1203/chromium.src,zcbenz/cefode-chromium,timopulkkinen/BubbleFish,Fireblend/chromium-crosswalk,bright-sparks/chromium-spacewalk,littlstar/chromium.src,keishi/chromium,keishi/chromium,anirudhSK/chromium,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk-efl,junmin-zhu/chromium-rivertrail,Jonekee/chromium.src,hujiajie/pa-chromium,Pluto-tv/chromium-crosswalk,nacl-webkit/chrome_deps,crosswalk-project/chromium-crosswalk-efl,mogoweb/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,Just-D/chromium-1,dushu1203/chromium.src,mogoweb/chromium-crosswalk,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,anirudhSK/chromium,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,robclark/chromium,ltilve/chromium,hgl888/chromium-crosswalk,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,markYoungH/chromium.src,patrickm/chromium.src,nacl-webkit/chrome_deps,krieger-od/nwjs_chromium.src,ChromiumWebApps/chromium,TheTypoMaster/chromium-crosswalk,Jonekee/chromium.src,littlstar/chromium.src,Pluto-tv/chromium-crosswalk,keishi/chromium,junmin-zhu/chromium-rivertrail,hujiajie/pa-chromium,littlstar/chromium.src,junmin-zhu/chromium-rivertrail,bright-sparks/chromium-spacewalk,fujunwei/chromium-crosswalk,jaruba/chromium.src,dushu1203/chromium.src,ChromiumWebApps/chromium,Chilledheart/chromium,robclark/chromium,robclark/chromium,littlstar/chromium.src,dednal/chromium.src,robclark/chromium,pozdnyakov/chromium-crosswalk,krieger-od/nwjs_chromium.src,M4sse/chromium.src,ChromiumWebApps/chromium,jaruba/chromium.src,crosswalk-project/chromium-crosswalk-efl,TheTypoMaster/chromium-crosswalk,Jonekee/chromium.src,keishi/chromium,markYoungH/chromium.src,dednal/chromium.src,markYoungH/chromium.src,markYoungH/chromium.src,jaruba/chromium.src,fujunwei/chromium-crosswalk,nacl-webkit/chrome_deps,M4sse/chromium.src,axinging/chromium-crosswalk,robclark/chromium,mogoweb/chromium-crosswalk,nacl-webkit/chrome_deps,anirudhSK/chromium,ondra-novak/chromium.src,hgl888/chromium-crosswalk,Just-D/chromium-1,hujiajie/pa-chromium,nacl-webkit/chrome_deps,dushu1203/chromium.src,hgl888/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,markYoungH/chromium.src,anirudhSK/chromium,rogerwang/chromium,Chilledheart/chromium,Jonekee/chromium.src,nacl-webkit/chrome_deps,rogerwang/chromium,dednal/chromium.src,chuan9/chromium-crosswalk,timopulkkinen/BubbleFish,nacl-webkit/chrome_deps,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,ChromiumWebApps/chromium,Pluto-tv/chromium-crosswalk,junmin-zhu/chromium-rivertrail,timopulkkinen/BubbleFish,Jonekee/chromium.src,zcbenz/cefode-chromium,mohamed--abdel-maksoud/chromium.src,ltilve/chromium,Jonekee/chromium.src,M4sse/chromium.src,crosswalk-project/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,dednal/chromium.src,ondra-novak/chromium.src,zcbenz/cefode-chromium,robclark/chromium,pozdnyakov/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,bright-sparks/chromium-spacewalk,TheTypoMaster/chromium-crosswalk,rogerwang/chromium,junmin-zhu/chromium-rivertrail,ltilve/chromium,timopulkkinen/BubbleFish,hgl888/chromium-crosswalk,hgl888/chromium-crosswalk,hujiajie/pa-chromium,axinging/chromium-crosswalk,Chilledheart/chromium,markYoungH/chromium.src,keishi/chromium,Fireblend/chromium-crosswalk,Just-D/chromium-1,ltilve/chromium,mohamed--abdel-maksoud/chromium.src,crosswalk-project/chromium-crosswalk-efl,robclark/chromium,axinging/chromium-crosswalk,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,ondra-novak/chromium.src,zcbenz/cefode-chromium,timopulkkinen/BubbleFish,axinging/chromium-crosswalk,axinging/chromium-crosswalk,hujiajie/pa-chromium,Fireblend/chromium-crosswalk,nacl-webkit/chrome_deps,ChromiumWebApps/chromium,nacl-webkit/chrome_deps,krieger-od/nwjs_chromium.src,keishi/chromium,dushu1203/chromium.src,hgl888/chromium-crosswalk-efl,dednal/chromium.src,fujunwei/chromium-crosswalk,anirudhSK/chromium,mohamed--abdel-maksoud/chromium.src,PeterWangIntel/chromium-crosswalk,mogoweb/chromium-crosswalk,rogerwang/chromium,jaruba/chromium.src,jaruba/chromium.src,hujiajie/pa-chromium,zcbenz/cefode-chromium,pozdnyakov/chromium-crosswalk,Chilledheart/chromium,mogoweb/chromium-crosswalk,timopulkkinen/BubbleFish,bright-sparks/chromium-spacewalk,PeterWangIntel/chromium-crosswalk,robclark/chromium,ltilve/chromium,junmin-zhu/chromium-rivertrail,nacl-webkit/chrome_deps,mohamed--abdel-maksoud/chromium.src,ChromiumWebApps/chromium,ondra-novak/chromium.src,ChromiumWebApps/chromium,chuan9/chromium-crosswalk,anirudhSK/chromium,axinging/chromium-crosswalk,krieger-od/nwjs_chromium.src,keishi/chromium,fujunwei/chromium-crosswalk,fujunwei/chromium-crosswalk,axinging/chromium-crosswalk,jaruba/chromium.src,ChromiumWebApps/chromium