drm/amdgpu: move some release handles into fail labels (v2)

Clean up the codes to move the release handles into fail labels.

v2: squash in Christian's regression fix

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>