driver core: fix up missed drivers/s390/char/hmcdrv_dev.c class.devnode() conversion.

Fixes: ff62b8e6 ("driver core: make struct class.devnode() take a const *")
Link: https://lore.kernel.org/r/20221130123851.6a9f2242@canb.auug.org.auSigned-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/s390/char/hmcdrv_dev.c

@@ -90,7 +90,7 @@ static dev_t hmcdrv_dev_no; /* device number (major/minor) */
  *
  * Return: recommended device file name in /dev
  */
-static char *hmcdrv_dev_name(struct device *dev, umode_t *mode)
+static char *hmcdrv_dev_name(const struct device *dev, umode_t *mode)
 {
 	char *nodename = NULL;
 	const char *devname = dev_name(dev); /* kernel device name */