drm/msm: fix leak in failed submit path

Change-Id: Ic0dedbadf485dd63ef727402b653a9d996a13632
Signed-off-by: Rob Clark <robdclark@gmail.com>
Git-commit: 40e6815bba6e34e5560e8855b43cd3eb17b24b09
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[jcrouse@codeaurora.org: fix merge conflicts and initialize node at create]
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>