mlxsw: spectrum_router: avoid potential uninitialized data usage

If fi->fib_nhs is zero, the router interface pointer is uninitialized, as shown by
this warning:

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c: In function 'mlxsw_sp_router_fib_event':
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:1674:21: error: 'r' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:1643:23: note: 'r' was declared here

This changes the loop so we handle the case the same way as finding no router
interface pointer attached to one of the nexthops to ensure we always
trap here instead of using uninitialized data.

Fixes: b45f64d1 ("mlxsw: spectrum_router: Use FIB notifications instead of switchdev calls")
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -1640,7 +1640,7 @@ mlxsw_sp_router_fib4_entry_init(struct mlxsw_sp *mlxsw_sp,
 				struct mlxsw_sp_fib_entry *fib_entry)
 {
 	struct fib_info *fi = fen_info->fi;
-	struct mlxsw_sp_rif *r;
+	struct mlxsw_sp_rif *r = NULL;
 	int nhsel;
 	int err;
 
@@ -1664,11 +1664,15 @@ mlxsw_sp_router_fib4_entry_init(struct mlxsw_sp *mlxsw_sp,
 			 * to us. Set trap and pass the packets for
 			 * this prefix to kernel.
 			 */
-			fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;
-			return 0;
+			break;
 		}
 	}
 
+	if (!r) {
+		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;
+		return 0;
+	}
+
 	if (fi->fib_scope != RT_SCOPE_UNIVERSE) {
 		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
 		fib_entry->rif = r->rif;