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/wireless/core.h b/net/wireless/core.h
index 37580e0..5d89310 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -86,7 +86,7 @@
 static inline
 bool wiphy_idx_valid(int wiphy_idx)
 {
-	return (wiphy_idx >= 0);
+	return wiphy_idx >= 0;
 }