ISAC_main_inst initialized to NULL to avoid potentially garbage pointer passed to WebRtcIsacfix_EncoderInit BUG=1211 TESTED=local build on Windows.  Failed previously with vs2012.  With this change kenny.cc builds. Review URL: https://webrtc-codereview.appspot.com/984004
ISAC_main_inst initialized to NULL to avoid potentially garbage pointer passed to WebRtcIsacfix_EncoderInit
BUG=1211
TESTED=local build on Windows.  Failed previously with vs2012.  With this change kenny.cc builds.
Review URL: https://webrtc-codereview.appspot.com/984004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@3277 4adac7df-926f-26a2-2b94-8c16560cd09d

krieger-od/webrtc,sippet/webrtc,jchavanton/webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,sippet/webrtc,AOSPU/external_chromium_org_third_party_webrtc,lukeweber/webrtc-src-override,aleonliao/webrtc-trunk,xhook/webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,krieger-od/webrtc,xhook/webrtc,AOSPU/external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,krieger-od/webrtc,jchavanton/webrtc,svn2github/webrtc-Revision-8758,Omegaphora/external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,krieger-od/webrtc,sippet/webrtc,Alkalyne/webrtctrunk,svn2github/webrtc-Revision-8758,krieger-od/nwjs_chromium_webrtc,svn2github/webrtc-Revision-8758,SlimXperiments/external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,lukeweber/webrtc-src-override,CyanogenMod/android_external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,Alkalyne/webrtctrunk,sippet/webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,xhook/webrtc,lukeweber/webrtc-src-override,sippet/webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,unisontech/webrtc-core,bpsinc-native/src_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,lukeweber/webrtc-src-override,aleonliao/webrtc-trunk,xin3liang/platform_external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,svn2github/webrtc-Revision-8758,PersonifyInc/chromium_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,PersonifyInc/chromium_webrtc,unisontech/webrtc-core,jchavanton/webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,krieger-od/nwjs_chromium_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,svn2github/webrtc-Revision-8758,SlimXperiments/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,unisontech/webrtc-core,SlimXperiments/external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,sippet/webrtc,MIPS/external-chromium_org-third_party-webrtc,MIPS/external-chromium_org-third_party-webrtc,PersonifyInc/chromium_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,xhook/webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,xin3liang/platform_external_chromium_org_third_party_webrtc,aleonliao/webrtc-trunk,MIPS/external-chromium_org-third_party-webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,xhook/webrtc,bpsinc-native/src_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,xhook/webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,krieger-od/nwjs_chromium_webrtc,aleonliao/webrtc-trunk,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,krieger-od/webrtc,jchavanton/webrtc,lukeweber/webrtc-src-override,jchavanton/webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,jchavanton/webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,aleonliao/webrtc-trunk,Omegaphora/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,bpsinc-native/src_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,Alkalyne/webrtctrunk,krieger-od/nwjs_chromium_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,aleonliao/webrtc-trunk,xin3liang/platform_external_chromium_org_third_party_webrtc,svn2github/webrtc-Revision-8758,krieger-od/nwjs_chromium_webrtc,jchavanton/webrtc,PersonifyInc/chromium_webrtc,krieger-od/nwjs_chromium_webrtc,krieger-od/webrtc,PersonifyInc/chromium_webrtc,MIPS/external-chromium_org-third_party-webrtc,unisontech/webrtc-core,android-ia/platform_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,unisontech/webrtc-core,Omegaphora/external_chromium_org_third_party_webrtc,unisontech/webrtc-core,PersonifyInc/chromium_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,Alkalyne/webrtctrunk