watchdog: npcm: Remove unnecessary NULL check before clk_prepare_enable/clk_disable_unprepare

clk_prepare_enable() and clk_disable_unprepare() already checked
NULL clock parameter.Remove unneeded NULL check for clk here.

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250313084420.2481763-1-nichen@iscas.ac.cn
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Chen Ni

drivers/watchdog/npcm_wdt.c

@@ -68,8 +68,7 @@ static int npcm_wdt_start(struct watchdog_device *wdd)
 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
 	u32 val;
 
-	if (wdt->clk)
-		clk_prepare_enable(wdt->clk);
+	clk_prepare_enable(wdt->clk);
 
 	if (wdd->timeout < 2)
 		val = 0x800;
@@ -105,8 +104,7 @@ static int npcm_wdt_stop(struct watchdog_device *wdd)
 
 	writel(0, wdt->reg);
 
-	if (wdt->clk)
-		clk_disable_unprepare(wdt->clk);
+	clk_disable_unprepare(wdt->clk);
 
 	return 0;
 }
@@ -156,8 +154,7 @@ static int npcm_wdt_restart(struct watchdog_device *wdd,
 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
 
 	/* For reset, we start the WDT clock and leave it running. */
-	if (wdt->clk)
-		clk_prepare_enable(wdt->clk);
+	clk_prepare_enable(wdt->clk);
 
 	writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, wdt->reg);
 	udelay(1000);