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/net/ipv4/arp.c b/net/ipv4/arp.c
index dcfe7e9..4083c18 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -567,7 +567,7 @@
 	if (out_dev)
 		omi = IN_DEV_MEDIUM_ID(out_dev);
 
-	return (omi != imi && omi != -1);
+	return omi != imi && omi != -1;
 }
 
 /*