thermal/drivers/mediatek/lvts_thermal: Fix error check in lvts_debugfs_init()

debugfs_create_dir() function returns an error value embedded in
the pointer (PTR_ERR). Evaluate the return value using IS_ERR
rather than checking for NULL.

Signed-off-by: Minjie Du <[email protected]>
Reviewed-by: Alexandre Mergnat <[email protected]>
Reviewed-by: Chen-Yu Tsai <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Minjie Du

drivers/thermal/mediatek/lvts_thermal.c

@@ -219,7 +219,7 @@ static int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td)
 
 		sprintf(name, "controller%d", i);
 		dentry = debugfs_create_dir(name, lvts_td->dom_dentry);
-		if (!dentry)
+		if (IS_ERR(dentry))
 			continue;
 
 		regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);