kobject: free memory if netlink_kernel_create() fails

There is a kfree(ue_sk) missing on the error path if
netlink_kernel_create() fails.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index e2eb989..b935795 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -380,6 +380,7 @@
 	if (!ue_sk->sk) {
 		printk(KERN_ERR
 		       "kobject_uevent: unable to create netlink socket!\n");
+		kfree(ue_sk);
 		return -ENODEV;
 	}
 	mutex_lock(&uevent_sock_mutex);