mdio: mux: avoid 'maybe-uninitialized' warning

The latest changes to the MDIO code introduced a false-positive
warning with gcc-6 (possibly others):

drivers/net/phy/mdio-mux.c: In function 'mdio_mux_init':
drivers/net/phy/mdio-mux.c:188:3: error: 'parent_bus_node' may be used uninitialized in this function [-Werror=maybe-uninitialized]

It's easy to avoid the warning by making sure the parent_bus_node
is initialized in both cases at the start of the function, since
the later 'of_node_put()' call is also valid for a NULL pointer
argument.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: f20e6657 ("mdio: mux: Enhanced MDIO mux framework for integrated multiplexers")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-mux.c

@@ -115,6 +115,7 @@ int mdio_mux_init(struct device *dev,
 			goto err_parent_bus;
 		}
 	} else {
+		parent_bus_node = NULL;
 		parent_bus = mux_bus;
 	}
 
@@ -184,7 +185,6 @@ int mdio_mux_init(struct device *dev,
 	put_device(&pb->mii_bus->dev);
 
 err_parent_bus:
-	if (!mux_bus)
 	of_node_put(parent_bus_node);
 	return ret_val;
 }