We've been fuzzing torchvision with [sydr-fuzz](https://github.com/ispras/oss-sydr-fuzz)
and found out of bounds error in ffmpeg project at audioconvert.c:151.
To prevent error we need to fix checks for in and out fmt in swr_init.
Signed-off-by: Eli Kobrin <kobrineli@ispras.ru>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>