drm/pl111: pl111_vexpress.c: Add of_node_put() before return

Each iteration of for_each_available_child_of_node puts the previous
node, but in the case of a break from the middle of the loop there is
no put, thus causing a memory leak. Hence add an of_node_put before the
break.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190706132742.3250-1-nishkadg.linux@gmail.com

drivers/gpu/drm/pl111/pl111_vexpress.c

@@ -51,6 +51,7 @@ int pl111_vexpress_clcd_init(struct device *dev,
 		}
 		if (of_device_is_compatible(child, "arm,hdlcd")) {
 			has_coretile_hdlcd = true;
+			of_node_put(child);
 			break;
 		}
 	}