video: fbdev: au1200fb: Fix incorrect IRQ freeing

'au1200fb_drv_probe()' can not fail after a successful call to
'request_irq()'. So there is no point to call 'free_irq()' in the error
handling path.

Moreover, the hard coded AU1200_LCD_INT looks boggus since
commit 1630d85a ("au1200fb: fix hardcoded IRQ").

So, remove it.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Tejun Heo <tj@kernel.org>
[b.zolnierkie: patch summary and description fixups]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/au1200fb.c

@@ -1766,8 +1766,6 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 			fb_dealloc_cmap(&fbi->cmap);
 		kfree(fbi->pseudo_palette);
 	}
-	if (plane == 0)
-		free_irq(AU1200_LCD_INT, (void*)dev);
 	return ret;
 }