watchdog: realtek_otto: Use devm_clk_get_enabled() helper

The devm_clk_get_enabled() helper:
- calls devm_clk_get()
- calls clk_prepare_enable() and registers what is needed in order to
call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code and avoids the need of a dedicated function used
with devm_add_action_or_reset().

Signed-off-by: Christophe JAILLET <[e-mail]>
Acked-by: Sander Vanheule <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/5e4255782f[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/realtek_otto_wdt.c

···
 		WDIOF_PRETIMEOUT,
 };
 
-static void otto_wdt_clock_action(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int otto_wdt_probe_clk(struct otto_wdt_ctrl *ctrl)
 {
-	struct clk *clk = devm_clk_get(ctrl->dev, NULL);
-	int ret;
+	struct clk *clk;
 
+	clk = devm_clk_get_enabled(ctrl->dev, NULL);
 	if (IS_ERR(clk))
 		return dev_err_probe(ctrl->dev, PTR_ERR(clk), "Failed to get clock\n");
-
-	ret = clk_prepare_enable(clk);
-	if (ret)
-		return dev_err_probe(ctrl->dev, ret, "Failed to enable clock\n");
-
-	ret = devm_add_action_or_reset(ctrl->dev, otto_wdt_clock_action, clk);
-	if (ret)
-		return ret;
 
 	ctrl->clk_rate_khz = clk_get_rate(clk) / 1000;
 	if (ctrl->clk_rate_khz == 0)