sysdev: Fixup warning message

Use gcc's __func__ instead of the function name.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/sys.c

@@ -181,8 +181,8 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
 	int err = 0;
 
 	if (!cls) {
-		WARN(1, KERN_WARNING "sysdev: invalid class passed to "
-			"sysdev_driver_register!\n");
+		WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n",
+			__func__);
 		return -EINVAL;
 	}