Do not read uninitialized buffer, no matter if it will be multiplied by  zero later. This should fix some valgrind warnings and hopefully FATE  ra144 test on ARM.
Do not read uninitialized buffer, no matter if it will be multiplied by 
zero later. This should fix some valgrind warnings and hopefully FATE 
ra144 test on ARM.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17677 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg