net: avoid unnecessary sock_flag() check when enable timestamp

The sock_flag() check is alreay inside sock_enable_timestamp(), so it is
unnecessary checking it in the caller.

    void sock_enable_timestamp(struct sock *sk, int flag)
    {
        if (!sock_flag(sk, flag)) {
            ...
        }
    }
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/compat.c

@@ -466,7 +466,6 @@ int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 
 	ctv = (struct compat_timeval __user *) userstamp;
 	err = -ENOENT;
-	if (!sock_flag(sk, SOCK_TIMESTAMP))
 	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 	tv = ktime_to_timeval(sk->sk_stamp);
 	if (tv.tv_sec == -1)
@@ -494,7 +493,6 @@ int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *usersta
 
 	ctv = (struct compat_timespec __user *) userstamp;
 	err = -ENOENT;
-	if (!sock_flag(sk, SOCK_TIMESTAMP))
 	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 	ts = ktime_to_timespec(sk->sk_stamp);
 	if (ts.tv_sec == -1)

net/core/sock.c

@@ -2900,7 +2900,7 @@ EXPORT_SYMBOL(lock_sock_fast);
 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 {
 	struct timeval tv;
-	if (!sock_flag(sk, SOCK_TIMESTAMP))
+
 	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 	tv = ktime_to_timeval(sk->sk_stamp);
 	if (tv.tv_sec == -1)
@@ -2916,7 +2916,7 @@ EXPORT_SYMBOL(sock_get_timestamp);
 int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 {
 	struct timespec ts;
-	if (!sock_flag(sk, SOCK_TIMESTAMP))
+
 	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 	ts = ktime_to_timespec(sk->sk_stamp);
 	if (ts.tv_sec == -1)