counter: stm32-timer-cnt: fix device_node handling in probe_encoder()

commit 147359e23e5c9652ff8c5a98a51a7323bd51c94a upstream.

Device nodes accessed via of_get_compatible_child() require
of_node_put() to be called when the node is no longer required to avoid
leaving a reference to the node behind, leaking the resource.

In this case, the usage of 'tnode' is straightforward and there are no
error paths, allowing for a single of_node_put() when 'tnode' is no
longer required.

Cc: stable@vger.kernel.org
Fixes: 29646ee33c ("counter: stm32-timer-cnt: add checks on quadrature encoder capability")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20241027-stm32-timer-cnt-of_node_put-v1-1-ebd903cdf7ac@gmail.com
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/counter/stm32-timer-cnt.c

@@ -700,6 +700,7 @@ static int stm32_timer_cnt_probe_encoder(struct device *dev,
 	}
 
 	ret = of_property_read_u32(tnode, "reg", &idx);
+	of_node_put(tnode);
 	if (ret) {
 		dev_err(dev, "Can't get index (%d)\n", ret);
 		return ret;