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/irda/stir4200.c b/drivers/net/irda/stir4200.c
index e5698fa..41c96b3 100644
--- a/drivers/net/irda/stir4200.c
+++ b/drivers/net/irda/stir4200.c
@@ -219,7 +219,7 @@
 
 static inline int isfir(u32 speed)
 {
-	return (speed == 4000000);
+	return speed == 4000000;
 }
 
 /*