rtc: sh: silence warning

Silence:
drivers/rtc/rtc-sh.c:517:58: warning: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 3 [-Wformat-truncation=]

Link: https://lore.kernel.org/r/20230911095052.1292869-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-sh.c

@@ -469,7 +469,7 @@ static int __init sh_rtc_probe(struct platform_device *pdev)
 {
 	struct sh_rtc *rtc;
 	struct resource *res;
-	char clk_name[6];
+	char clk_name[14];
 	int clk_id, ret;
 
 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);