avcodec/bitstream: remove unused variable

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/utils: Print warning if avcodec_set_dimensions() failed

Fixes CID1135744
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/aeval: Fix use of uninitialized variable

Fixes CID1135776

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>