avformat/mov: Fix parsing short loci

Fixes Ticket4557

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 50393bce31a5618f5125aaaf97bb69886fc4261d)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 1e66c24..d130597 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -229,7 +229,7 @@
     avio_skip(pb, 1); // role
     len -= 1;
 
-    if (len < 14) {
+    if (len < 12) {
         av_log(c->fc, AV_LOG_ERROR, "no space for coordinates left (%d)\n", len);
         return AVERROR_INVALIDDATA;
     }