[PATCH] can-j1939: fix ifnullfree.cocci warnings

[kbuild test robot <fengguang.wu@intel.com>]

net/can/j1939/socket.c:528:3-8: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

CC: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---

 socket.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -524,8 +524,7 @@ static int j1939sk_setsockopt(struct soc
 		jsk->filters = filters;
 		jsk->nfilters = count;
 		spin_unlock_bh(&j1939_socks_lock);
-		if (ofilters)
-			kfree(ofilters);
+		kfree(ofilters);
 		return 0;
 	case SO_J1939_PROMISC:
 		return j1939sk_setsockopt_flag(jsk, optval, optlen, PROMISC);