backlight: led_bl: Use devm_kcalloc() for array space allocation

Replace calls of devm_kzalloc() with devm_kcalloc() in led_bl_get_leds()
and led_bl_parse_levels() for safer memory allocation with built-in
overflow protection.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Reviewed-by: "Daniel Thompson (RISCstar)" <danielt@kernel.org>
Link: https://lore.kernel.org/r/20250819035804.433615-1-rongqianfeng@vivo.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: qianfengrong

drivers/video/backlight/led_bl.c

@@ -89,7 +89,7 @@ static int led_bl_get_leds(struct device *dev,
 		return -EINVAL;
 	}
 
-	leds = devm_kzalloc(dev, sizeof(struct led_classdev *) * nb_leds,
+	leds = devm_kcalloc(dev, nb_leds, sizeof(struct led_classdev *),
 			    GFP_KERNEL);
 	if (!leds)
 		return -ENOMEM;
@@ -137,7 +137,7 @@ static int led_bl_parse_levels(struct device *dev,
 		unsigned int db;
 		u32 *levels = NULL;
 
-		levels = devm_kzalloc(dev, sizeof(u32) * num_levels,
+		levels = devm_kcalloc(dev, num_levels, sizeof(u32),
 				      GFP_KERNEL);
 		if (!levels)
 			return -ENOMEM;