Anton Khirnov 60cb07196f lavf: add avformat_close_input(). ...

It sets the supplied AVFormatContext pointer to NULL after freeing it,
which is safer and its name is consistent with other lavf functions.

Also deprecate av_close_input_file().
(cherry picked from commit 526604545f)

Conflicts:

	doc/APIchanges
	libavformat/utils.c
	libavformat/version.h

2012-01-03 17:47:08 +01:00

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