drm/amdgpu: Fix a deadlock if previous GEM object allocation fails

drm/amdgpu: Fix a deadlock if previous GEM object allocation fails

commit 703677d9345d87d7288ed8a2483ca424af7d4b3b upstream.

Fall through to handle the error instead of return.

Fixes: f8aab60422c37 ("drm/amdgpu: Initialise drm_gem_object_funcs for imported BOs")
Cc: stable@vger.kernel.org
Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>