Fix build error(ISO C90 specs violation) in lxc.c
Fix build error(ISO C90 specs violation) in lxc.c

This patch fixes following build errors.

running build_ext
building '_lxc' extension
creating build/temp.linux-x86_64-3.4
gcc -pthread -Wno-unused-result -Werror=declaration-after-statement -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong --param=ssp-buffer-size=4 -fPIC -I../../src -I../../src -I/usr/include/python3.4m -c lxc.c -o ./build/temp.linux-x86_64-3.4/lxc.o
lxc.c: In function ‘convert_tuple_to_char_pointer_array’:
lxc.c:49:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
     char **result = (char**) calloc(argc + 1, sizeof(char*));
     ^
lxc.c:60:9: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
         char *str = NULL;
         ^
lxc.c: In function ‘Container_get_cgroup_item’:
lxc.c:822:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
     char* value = (char*) malloc(sizeof(char)*len + 1);
     ^
lxc.c: In function ‘Container_get_config_item’:
lxc.c:861:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
     char* value = (char*) malloc(sizeof(char)*len + 1);
     ^
lxc.c: In function ‘Container_get_keys’:
lxc.c:903:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
     char* value = (char*) malloc(sizeof(char)*len + 1);
     ^
cc1: some warnings being treated as errors
error: command 'gcc' failed with exit status 1
Makefile:472: recipe for target 'all' failed
make[3]: *** [all] Error 1
make[3]: Leaving directory '/home/masami/codes/lxc/src/python-lxc'
Makefile:394: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/masami/codes/lxc/src'
Makefile:338: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/home/masami/codes/lxc/src'
Makefile:484: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

build env:
distribution: Arch Linux
gcc version 4.9.1 20140903 (prerelease) (GCC)

Signed-off-by: Masami Ichikawa <64f6eed02948c28fcab25592fa23a3f3bed03ecd@gmail.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

hallyn/lxc,codebauss/lxc,bmoar/lxc,ysbnim/lxc,regit/lxc,virajs/lxc,hfuCN/lxc,QingweiPeterLan/cs188-lxc,szaszg/lxc,szaszg/lxc,lazy404/lxc,federicobriata/lxc,rldleblanc/lxc,QingweiPeterLan/cs188-lxc,DarknessBeforeDawn/lxc,cjwatson/lxc,aeris/lxc,akshaykarle/lxc,caglar10ur/lxc,major/lxc,raspberrypython/lxc,ecarrara/lxc,lisongmin/lxc,JohnPeacockMessageSystems/lxc,tych0/lxc,ksperis/lxc,rldleblanc/lxc,rowhit/lxc,federicobriata/lxc,ioops/lxc,LynxChaus/lxc,yubo/lxc,QingweiPeterLan/cs188-lxc,GreatFruitOmsk/lxc,aeris/lxc,codebauss/lxc,fwilson42/lxc,Pelagicore/lxc,cjwatson/lxc,GreatFruitOmsk/lxc,bmoar/lxc,aeris/lxc,Distrotech/lxc,lazy404/lxc,sapun/lxc,jirislaby/lxc,thmo/lxc,ss1h2a3tw/lxc,jirislaby/lxc,terceiro/lxc,hallyn/lxc,caglar10ur/lxc,terceiro/lxc,fwilson42/lxc,weizhenwei/lxc,ecarrara/lxc,Distrotech/lxc,JohnPeacockMessageSystems/lxc,armcc/lxc,lazy404/lxc,ysbnim/lxc,JohnPeacockMessageSystems/lxc,fwilson42/lxc,codebauss/lxc,virajs/lxc,bostjan/lxc,Ponce/lxc,armcc/lxc,weizhenwei/lxc,DarknessBeforeDawn/lxc,thmo/lxc,ksperis/lxc,ioops/lxc,rowhit/lxc,tych0/lxc,Distrotech/lxc,major/lxc,raspberrypython/lxc,Ponce/lxc,terceiro/lxc,rowhit/lxc,hallyn/lxc,Pelagicore/lxc,hkjolhede/lxc,LynxChaus/lxc,lisongmin/lxc,christiaan/lxc,sapun/lxc,sapun/lxc,akshaykarle/lxc,tych0/lxc,hkjolhede/lxc,LynxChaus/lxc,hkjolhede/lxc,christiaan/lxc,yubo/lxc,federicobriata/lxc,hfuCN/lxc,bmoar/lxc,ksperis/lxc,GreatFruitOmsk/lxc,Ponce/lxc,major/lxc,bostjan/lxc,Pelagicore/lxc,szaszg/lxc,efiop/lxc,christiaan/lxc,thmo/lxc,DarknessBeforeDawn/lxc,weizhenwei/lxc,rldleblanc/lxc,ss1h2a3tw/lxc,akshaykarle/lxc,regit/lxc,ss1h2a3tw/lxc,efiop/lxc,caglar10ur/lxc,regit/lxc,ysbnim/lxc,virajs/lxc,bostjan/lxc,cjwatson/lxc,jirislaby/lxc,ecarrara/lxc,armcc/lxc,raspberrypython/lxc,ioops/lxc,efiop/lxc,hfuCN/lxc,yubo/lxc,lisongmin/lxc