powerpc/irq.c: Add of_node_put to avoid memory leak

In this case, a device_node structure is stored in another structure that
is then freed without first decrementing the reference count of the
device_node structure.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression x;
identifier f;
position p1,p2;
@@

x@p1->f = \(of_find_node_by_path\|of_find_node_by_name\|of_find_node_by_phandle\|of_get_parent\|of_get_next_parent\|of_get_next_child\|of_find_compatible_node\|of_match_node\|of_find_node_by_type\|of_find_node_with_property\|of_find_matching_node\|of_parse_phandle\|of_node_get\)(...);
... when != of_node_put(x)
kfree@p2(x)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@
cocci.print_main("call",p1)
cocci.print_secs("free",p2)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/irq.c

@@ -587,8 +587,10 @@ struct irq_host *irq_alloc_host(struct device_node *of_node,
 			 * this will be fixed once slab is made available early
 			 * instead of the current cruft
 			 */
-			if (mem_init_done)
+			if (mem_init_done) {
+				of_node_put(host->of_node);
 				kfree(host);
+			}
 			return NULL;
 		}
 		irq_map[0].host = host;