lavc: avoid invalid memcpy() in avcodec_default_release_buffer()
When the buf and last pointers are equal, the FFSWAP() results in an invalid call to memcpy() with same source and destination on some targets. Although assigning a struct to itself is valid C99, gcc does not check for this before calling memcpy(). See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32667Signed-off-by: NMans Rullgard <mans@mansr.com>
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