Fixes out of array read
Fixes: 1.swf
Found-by: 连一汉 <lianyihan@360.cn>
Tested-by: 连一汉 <lianyihan@360.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0e318f11)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>