lavf/mov.c: Avoid heap allocation wrap in mov_read_uuid

Core of patch is from paul@paulmehta.com
Reference https://crbug.com/643951

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Check value reduced as the code does not support values beyond INT_MAX
Also the check is moved to a more common place and before integer truncation

libavformat/mov.c

@@ -4789,7 +4789,7 @@ static int mov_read_uuid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         0x88, 0x14, 0x58, 0x7a, 0x02, 0x52, 0x1f, 0xdd,
     };
 
-    if (atom.size < sizeof(uuid) || atom.size == INT64_MAX)
+    if (atom.size < sizeof(uuid) || atom.size >= FFMIN(INT_MAX, SIZE_MAX))
         return AVERROR_INVALIDDATA;
 
     if (c->fc->nb_streams < 1)