net: dsa: rzn1-a5psw: add missing of_node_put() in a5psw_pcs_get()

of_parse_phandle() will increase the refcount of 'pcs_node', so add
of_node_put() before return from a5psw_pcs_get().

Fixes: 888cdb89 ("net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220630014153.1888811-1-yangyingliang@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/rzn1_a5psw.c

@@ -917,12 +917,14 @@ static int a5psw_pcs_get(struct a5psw *a5psw)
 		}
 
 		a5psw->pcs[reg] = pcs;
+		of_node_put(pcs_node);
 	}
 	of_node_put(ports);
 
 	return 0;
 
 free_pcs:
+	of_node_put(pcs_node);
 	of_node_put(port);
 	of_node_put(ports);
 	a5psw_pcs_free(a5psw);