Fix a warning in ffserver.c caused by the use of the function av_opt_string() deprecated since r14134.
Fix a warning in ffserver.c caused by the use of the function
av_opt_string() deprecated since r14134.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@14145 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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