Decoder: Initialize MB info buffer to zero.

Initialize the buffer used to store inter mb info
(reference index, weights etc) to zero.

Bug: 36035683

Change-Id: I23561a6a7fe852c0563a631d7ec6ab022cd78ccc
(cherry picked from commit 2575ae6c989b133554f9b1267cf5dd694cf2aae6)
(cherry picked from commit 9041bb17f70a94019e05459164b4756bde01edee)
1 file changed