Fixes out of array access
Fixes Ticket2895
Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 9a271a93

)

Conflicts:

	libavcodec/jpeg2000dec.c
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>