Merge commit 'c3e6e8f06c42499bd020fd0b37f9542150e6067b'

* commit 'c3e6e8f06c42499bd020fd0b37f9542150e6067b':
  mem: Do not check unsigned values for negative size

Conflicts:
	libavutil/mem.c

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

libavutil/mem.c

@@ -182,7 +182,7 @@ void *av_realloc_f(void *ptr, size_t nelem, size_t elsize)
 
 void *av_realloc_array(void *ptr, size_t nmemb, size_t size)
 {
-    if (size <= 0 || nmemb >= INT_MAX / size)
+    if (!size || nmemb >= INT_MAX / size)
         return NULL;
     return av_realloc(ptr, nmemb * size);
 }