Release resources if SkMallocPixelRef::NewWithProc fails.

Change-Id: I29b96cd9f2d2311b4caae092102f501dbc6a4fe8
Reviewed-on: https://skia-review.googlesource.com/9182
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2 files changed