locking/atomic, kref: Avoid more abuse

Leak references by unbalanced get, instead of poking at kref
implementation details.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

drivers/usb/mon/mon_main.c

@@ -409,7 +409,7 @@ static void __exit mon_exit(void)
 			printk(KERN_ERR TAG
 			    ": Outstanding opens (%d) on usb%d, leaking...\n",
 			    mbus->nreaders, mbus->u_bus->busnum);
-			atomic_set(&mbus->ref.refcount, 2);	/* Force leak */
+			kref_get(&mbus->ref); /* Force leak */
 		}
 
 		mon_dissolve(mbus, mbus->u_bus);