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: Mans Rullgard <mans@mansr.com>

libavcodec/utils.c

@@ -509,7 +509,8 @@ void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
         avci->buffer_count--;
         last = &avci->buffer[avci->buffer_count];
 
-        FFSWAP(InternalBuffer, *buf, *last);
+        if (buf != last)
+            FFSWAP(InternalBuffer, *buf, *last);
     }
 
     for (i = 0; i < AV_NUM_DATA_POINTERS; i++) {