drm/amdgpu: no need to log error in multi ring write

No need to log error in multi ring write as its taken
care during ring commit.

This is inline with change done in amdgpu_ring_write.

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