can: peak_usb: pcan_dump_mem(): mark input prompt and data pointer as const

Mark the input prompt and data pointer as const.

Link: https://lore.kernel.org/all/20220719120632.26774-1-s.grosjean@peak-system.comSigned-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
[mkl: mark data pointer as const, too; update commit message]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/peak_usb/pcan_usb_core.c

@@ -57,7 +57,7 @@ MODULE_DEVICE_TABLE(usb, peak_usb_table);
  * dump memory
  */
 #define DUMP_WIDTH	16
-void pcan_dump_mem(char *prompt, void *p, int l)
+void pcan_dump_mem(const char *prompt, const void *p, int l)
 {
 	pr_info("%s dumping %s (%d bytes):\n",
 		PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);

drivers/net/can/usb/peak_usb/pcan_usb_core.h

@@ -132,7 +132,7 @@ struct peak_usb_device {
 	struct peak_usb_device *next_siblings;
 };
 
-void pcan_dump_mem(char *prompt, void *p, int l);
+void pcan_dump_mem(const char *prompt, const void *p, int l);
 
 /* common timestamp management */
 void peak_usb_init_time_ref(struct peak_time_ref *time_ref,