auxdisplay: panel: Fix an API misuse in panel.c

Variable allocated by charlcd_alloc() should be released
by charlcd_free(). The following patch changed kfree() to
charlcd_free() to fix an API misuse.

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 718e05e ("auxdisplay: Introduce hd44780_common.[ch]")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Author: andy-shev

drivers/auxdisplay/panel.c

@@ -1664,7 +1664,7 @@ static void panel_attach(struct parport *port)
 	if (lcd.enabled)
 		charlcd_unregister(lcd.charlcd);
 err_unreg_device:
-	kfree(lcd.charlcd);
+	charlcd_free(lcd.charlcd);
 	lcd.charlcd = NULL;
 	parport_unregister_device(pprt);
 	pprt = NULL;
@@ -1692,7 +1692,7 @@ static void panel_detach(struct parport *port)
 		charlcd_unregister(lcd.charlcd);
 		lcd.initialized = false;
 		kfree(lcd.charlcd->drvdata);
-		kfree(lcd.charlcd);
+		charlcd_free(lcd.charlcd);
 		lcd.charlcd = NULL;
 	}