drivers/net: return operator cleanup

Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 5ec542d..0bbc0c3 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -250,7 +250,7 @@
 
 static int is_valid_veth_mtu(int new_mtu)
 {
-	return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU);
+	return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
 }
 
 static int veth_change_mtu(struct net_device *dev, int new_mtu)