Staging: Fix leak in drivers/staging/at76_usb.c

Fix leak in at76_usb as reported in:
http://bugzilla.kernel.org/show_bug.cgi?id=11778


Reported-by: Daniel Marjamäki <[e-mail]>
Signed-off-by: Diego Calleja <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/at76_usb/at76_usb.c

···
 	if (!iwe)
 		return -ENOMEM;
 
-	if (priv->scan_state != SCAN_COMPLETED)
+	if (priv->scan_state != SCAN_COMPLETED) {
 		/* scan not yet finished */
+		kfree(iwe);
 		return -EAGAIN;
+	}
 
 	spin_lock_irqsave(&priv->bss_list_spinlock, flags);