avcodec/x86/vp9dsp: merge a few SWAP together.
lavfi/aevalsrc: initialize pointer to expression to NULL

Fix crash in case of expression parsing failure.
doc/examples: do not check NULL values for avcodec_close()

avcodec_close() does nothing in case the argument is NULL. Simplify.
avformat/avidec: also print position in print_tag()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevc : update hevc_ps.c

(cherry picked from commit 088f2eb1ae42bffc63c2cee4e7eba8f47056043b)

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

(cherry picked from commit 0c8dfd8ad6400b33da55a9f4d9aa8d3f5c9d209f)

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