drm/amdgpu/userq: use pm_runtime_resume_and_get and fix err handling

drm/amdgpu/userq: use pm_runtime_resume_and_get and fix err handling

Use pm_runtime_resume_and_get instead of pm_runtime_get_sync as it
return error but put the reference in the function itself.

In goto statements we need to drop the pm reference too.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>