aes3: set p_aout_buffer before bailing
aes3: set p_aout_buffer before bailing

Otherwise it was returned uninitialized.

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