drm/msm: Defer fd_install in SUBMIT ioctl

drm/msm: Defer fd_install in SUBMIT ioctl

[ Upstream commit f22853435bbd1e9836d0dce7fd99c040b94c2bf1 ]

Avoid fd_install() until there are no more potential error paths, to
avoid put_unused_fd() after the fd is made visible to userspace.

Fixes: 68dc6c2d5eec ("drm/msm: Fix submit error-path leaks")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/665363/
Signed-off-by: Sasha Levin <sashal@kernel.org>