handle GrVkTransferBuffer::Create failure

Change-Id: I713dd7b678bfec6808bd6f57bfdf5748258e8b24
Reviewed-on: https://skia-review.googlesource.com/14420
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed