drm/msm/gem: Fix error code msm_parse_deps()

In the Linux kernel, the following vulnerability has been resolved:

drm/msm/gem: Fix error code msm_parse_deps()

The SUBMIT_ERROR() macro turns the error code negative. This extra '-'

operation turns it back to positive EINVAL again. The error code is

passed to ERR_PTR() and since positive values are not an IS_ERR() it

eventually will lead to an oops. Delete the '-'.

Patchwork: https://patchwork.freedesktop.org/patch/637625/