Guard buffer access in mfmv
Guard buffer access in mfmv

Avoid potential out of boundary buffer access issue.

Change-Id: Ic3766cd5bc2c1c8b4e1cbf38310fe6689aa38b59

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom