linux-imx

drm/amdgpu: minor cleanup in amdgpu_job.c

Remove superflous NULL check, fix coding style a bit, shorten error
messages.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Acked-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>