Fix a bug in ext-inter

Fix a case where handle_inter_mode could return without restoring
the original values of xd->plane[i].dst.buf. This fixes an
assertion failure in aom_blend_a64_mask, as well as very slightly
improving the rd costing accuracy.

Change-Id: I7f720bcf676c6aa9858c1a4c8f6571a76a9b0772
1 file changed