dict.c: minor simplification.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
avcodec/ratecontrol: remove unneeded statement

Found-by: CSA
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/flac_parser: remove duplicate assignent

Found-by: CSA
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/diracdec: remove unneeded assignment

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