[ROSE] rose_add_loopback_node: propagate -E

David Binderman's icc logs:
net/rose/rose_route.c(399): remark #593: variable "err" was set but never used
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rose/rose_route.c

@@ -396,7 +396,7 @@ int rose_add_loopback_neigh(void)
 int rose_add_loopback_node(rose_address *address)
 {
 	struct rose_node *rose_node;
-	unsigned int err = 0;
+	int err = 0;
 
 	spin_lock_bh(&rose_node_list_lock);
 
@@ -432,7 +432,7 @@ int rose_add_loopback_node(rose_address *address)
 out:
 	spin_unlock_bh(&rose_node_list_lock);
 
-	return 0;
+	return err;
 }
 
 /*