drm/amdgpu: correct the runtime deference for mes_userq_mqd_create()

When the runtime resume failed, then the runtime uage decreased at
free_mqd. So the runtime resume error handler doesn't need to decrease
the runtime usage separately.

Fixes: 4baa0dca ("drm/amdgpu: validate return value of pm_runtime_get_sync")
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>