Merge remote-tracking branch 'qatar/master'

* qatar/master:
  rtmp: Do not misuse memcmp

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

diff --cc libavformat/rtmppkt.c
Simple merge

diff --cc libavformat/rtmppkt.h
Simple merge

diff --cc libavformat/rtmpproto.c
Simple merge