amdgpu/amdgpu_ids: fix kmalloc_array not uses number as first arg

Fix check_patch.pl warning:
kmalloc_array uses number as first arg, sizeof is generally wrong.
+fences = kmalloc_array(sizeof(void *), id_mgr->num_ids,
GFP_KERNEL);
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c

@@ -208,7 +208,7 @@ static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
 	if (ring->vmid_wait && !dma_fence_is_signaled(ring->vmid_wait))
 		return amdgpu_sync_fence(sync, ring->vmid_wait);
 
-	fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
+	fences = kmalloc_array(id_mgr->num_ids, sizeof(void *), GFP_KERNEL);
 	if (!fences)
 		return -ENOMEM;