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/wan/pc300_tty.c b/drivers/net/wan/pc300_tty.c
index 4293889..515d9b8 100644
--- a/drivers/net/wan/pc300_tty.c
+++ b/drivers/net/wan/pc300_tty.c
@@ -540,7 +540,7 @@
 		return -ENODEV; 
 	}
    
-	return(0); 
+	return 0;
 } 
 
 static int pc300_tiocmset(struct tty_struct *tty, struct file *file,