net/core: Make use of assign_bit() API

We have for some time the assign_bit() API to replace open coded

	if (foo)
		set_bit(n, bar);
	else
		clear_bit(n, bar);

Use this API in the code. No functional change intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Message-ID: <20230710100830.89936-1-andriy.shevchenko@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

net/core/dev.c

@@ -6316,12 +6316,8 @@ int dev_set_threaded(struct net_device *dev, bool threaded)
 	 * softirq mode will happen in the next round of napi_schedule().
 	 * This should not cause hiccups/stalls to the live traffic.
 	 */
-	list_for_each_entry(napi, &dev->napi_list, dev_list) {
-		if (threaded)
-			set_bit(NAPI_STATE_THREADED, &napi->state);
-		else
-			clear_bit(NAPI_STATE_THREADED, &napi->state);
-	}
+	list_for_each_entry(napi, &dev->napi_list, dev_list)
+		assign_bit(NAPI_STATE_THREADED, &napi->state, threaded);
 
 	return err;
 }

net/core/sock.c

@@ -1244,17 +1244,11 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
 		break;
 
 	case SO_PASSCRED:
-		if (valbool)
-			set_bit(SOCK_PASSCRED, &sock->flags);
-		else
-			clear_bit(SOCK_PASSCRED, &sock->flags);
+		assign_bit(SOCK_PASSCRED, &sock->flags, valbool);
 		break;
 
 	case SO_PASSPIDFD:
-		if (valbool)
-			set_bit(SOCK_PASSPIDFD, &sock->flags);
-		else
-			clear_bit(SOCK_PASSPIDFD, &sock->flags);
+		assign_bit(SOCK_PASSPIDFD, &sock->flags, valbool);
 		break;
 
 	case SO_TIMESTAMP_OLD:
@@ -1358,10 +1352,7 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
 		break;
 
 	case SO_PASSSEC:
-		if (valbool)
-			set_bit(SOCK_PASSSEC, &sock->flags);
-		else
-			clear_bit(SOCK_PASSSEC, &sock->flags);
+		assign_bit(SOCK_PASSSEC, &sock->flags, valbool);
 		break;
 	case SO_MARK:
 		if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&