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/inet_diag.c b/net/ipv4/inet_diag.c
index e5fa2dd..ba80426 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -425,7 +425,7 @@
 			bc += op->no;
 		}
 	}
-	return (len == 0);
+	return len == 0;
 }
 
 static int valid_cc(const void *bc, int len, int cc)