powerpc/pseries: fix memory leak in queue_hotplug_event() error path

If we fail to allocate work, we don't end up using hp_errlog_copy. Free it
in the error path.
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/pseries/dlpar.c

@@ -413,6 +413,7 @@ void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog,
 		queue_work(pseries_hp_wq, (struct work_struct *)work);
 	} else {
 		*rc = -ENOMEM;
+		kfree(hp_errlog_copy);
 		complete(hotplug_done);
 	}
 }