netlink: simplify nl_set_extack_cookie_u64(), nl_set_extack_cookie_u32()

Taking address of a function argument directly works just fine.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netlink.h

@@ -129,23 +129,19 @@ struct netlink_ext_ack {
 static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack,
 					    u64 cookie)
 {
-	u64 __cookie = cookie;
-
 	if (!extack)
 		return;
-	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
-	extack->cookie_len = sizeof(__cookie);
+	memcpy(extack->cookie, &cookie, sizeof(cookie));
+	extack->cookie_len = sizeof(cookie);
 }
 
 static inline void nl_set_extack_cookie_u32(struct netlink_ext_ack *extack,
 					    u32 cookie)
 {
-	u32 __cookie = cookie;
-
 	if (!extack)
 		return;
-	memcpy(extack->cookie, &__cookie, sizeof(__cookie));
-	extack->cookie_len = sizeof(__cookie);
+	memcpy(extack->cookie, &cookie, sizeof(cookie));
+	extack->cookie_len = sizeof(cookie);
 }
 
 void netlink_kernel_release(struct sock *sk);