Fix crash invalid params for vp8 multres. Add test.

Fix is from the patch in the issue.
Release memories allocated before early exit.

BUG=webm:1482

Change-Id: I64952af99c58241496e03fa55da09fd129a07c77
(cherry picked from commit 5b6ae020b6a972b67b59b3dbf7cf9cbd3140a80d)
2 files changed