mfd: dln2: Switch to managed resources and fix bare unsigned types

Convert dln2_probe and dln2_setup_rx_urbs to use devm_kzalloc() and
devm_kmalloc() respectively. This simplifies resource management by
allowing the removal of manual kfree() calls in dln2_free() and
dln2_free_rx_urbs().

Additionally, update bare 'unsigned' types to 'unsigned int' to satisfy
checkpatch.pl warnings and comply with the Linux kernel coding style.

Signed-off-by: Subhash Rawat <rawatsubhash02@gmail.com>
Link: https://patch.msgid.link/20260303183236.574940-1-rawatsubhash02@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: Shubzz-02

drivers/mfd/dln2.c

@@ -424,8 +424,8 @@ static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot)
 }
 
 static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
-			  const void *obuf, unsigned obuf_len,
-			  void *ibuf, unsigned *ibuf_len)
+			  const void *obuf, unsigned int obuf_len,
+			  void *ibuf, unsigned int *ibuf_len)
 {
 	int ret = 0;
 	int rx_slot;
@@ -511,8 +511,8 @@ static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
 }
 
 int dln2_transfer(struct platform_device *pdev, u16 cmd,
-		  const void *obuf, unsigned obuf_len,
-		  void *ibuf, unsigned *ibuf_len)
+		  const void *obuf, unsigned int obuf_len,
+		  void *ibuf, unsigned int *ibuf_len)
 {
 	struct dln2_platform_data *dln2_pdata;
 	struct dln2_dev *dln2;
@@ -583,10 +583,8 @@ static void dln2_free_rx_urbs(struct dln2_dev *dln2)
 {
 	int i;
 
-	for (i = 0; i < DLN2_MAX_URBS; i++) {
+	for (i = 0; i < DLN2_MAX_URBS; i++)
 		usb_free_urb(dln2->rx_urb[i]);
-		kfree(dln2->rx_buf[i]);
-	}
 }
 
 static void dln2_stop_rx_urbs(struct dln2_dev *dln2)
@@ -600,17 +598,17 @@ static void dln2_stop_rx_urbs(struct dln2_dev *dln2)
 static void dln2_free(struct dln2_dev *dln2)
 {
 	dln2_free_rx_urbs(dln2);
-	kfree(dln2);
 }
 
 static int dln2_setup_rx_urbs(struct dln2_dev *dln2,
 			      struct usb_host_interface *hostif)
 {
 	int i;
 	const int rx_max_size = DLN2_RX_BUF_SIZE;
+	struct device *dev = &dln2->interface->dev;
 
 	for (i = 0; i < DLN2_MAX_URBS; i++) {
-		dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL);
+		dln2->rx_buf[i] = devm_kmalloc(dev, rx_max_size, GFP_KERNEL);
 		if (!dln2->rx_buf[i])
 			return -ENOMEM;
 
@@ -777,7 +775,7 @@ static int dln2_probe(struct usb_interface *interface,
 	if (ret)
 		return ret;
 
-	dln2 = kzalloc_obj(*dln2);
+	dln2 = devm_kzalloc(dev, sizeof(*dln2), GFP_KERNEL);
 	if (!dln2)
 		return -ENOMEM;