media: ti-vpe: fix leaked of_node references

The call to of_get_parent returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
drivers/media/platform/ti-vpe/cal.c:1621:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 1607, but without a corresponding object release within this function.
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/ti-vpe/cal.c

@@ -1612,6 +1612,7 @@ of_get_next_port(const struct device_node *parent,
 			}
 			prev = port;
 		} while (!of_node_name_eq(port, "port"));
+		of_node_put(ports);
 	}
 
 	return port;