drm/amdgpu/userq: add the return code too in error condition

drm/amdgpu/userq: add the return code too in error condition

In function amdgpu_userq_restore
a. amdgpu_userq_vm_validate: add return code in error condition
b. amdgpu_userq_restore_all: It already prints the error log, just
   update the erorr log in the function and remove it from caller.

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