powerpc/pseries: Add missing of_node_put() in ibmebus

In ibmebus_match_path(), use of_node_put() to drop the reference
returned by of_find_node_by_path() before testing for equality of the
pointers.

Signed-off-by: Liang He <windhl@126.com>
[mpe: Rewrite change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220619074016.4068105-1-windhl@126.com

arch/powerpc/platforms/pseries/ibmebus.c

@@ -152,7 +152,11 @@ static const struct dma_map_ops ibmebus_dma_ops = {
 static int ibmebus_match_path(struct device *dev, const void *data)
 {
 	struct device_node *dn = to_platform_device(dev)->dev.of_node;
-	return (of_find_node_by_path(data) == dn);
+	struct device_node *tn = of_find_node_by_path(data);
+
+	of_node_put(tn);
+
+	return (tn == dn);
 }
 
 static int ibmebus_match_node(struct device *dev, const void *data)