avstring-test: Mark pointer passed to av_free() as non-const

libavutil/avstring.c:278:9: warning: passing argument 1 of ‘av_free’ discards ‘const’ qualifier from pointer target type
h263: K&R formatting cosmetics

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Signed-off-by: Diego Biurrun <diego@biurrun.de>
golomb: K&R formatting cosmetics

Signed-off-by: Diego Biurrun <diego@biurrun.de>