avcodec: remove unnecessary condition
avcodec: remove unnecessary condition

condition makes no sense in here, as skipframes is set already unconditionally
at the start of the block.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc