fbdev: broadsheetfb: fix potential memory leak in broadsheetfb_probe()

The memory allocated for pagerefs in fb_deferred_io_init() is not freed
on the error path. Fix it by calling fb_deferred_io_cleanup().

Fixes: 56c134f7f1 ("fbdev: Track deferred-I/O pages in pageref struct")
Cc: stable@vger.kernel.org
Signed-off-by: Abdun Nihaal <nihaal@cse.iitm.ac.in>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/broadsheetfb.c

@@ -1072,12 +1072,14 @@ static int broadsheetfb_probe(struct platform_device *dev)
 	info->flags = FBINFO_VIRTFB;
 
 	info->fbdefio = &broadsheetfb_defio;
-	fb_deferred_io_init(info);
+	retval = fb_deferred_io_init(info);
+	if (retval)
+		goto err_vfree;
 
 	retval = fb_alloc_cmap(&info->cmap, 16, 0);
 	if (retval < 0) {
 		dev_err(&dev->dev, "Failed to allocate colormap\n");
-		goto err_vfree;
+		goto err_fbdefio;
 	}
 
 	/* set cmap */
@@ -1121,6 +1123,8 @@ err_free_irq:
 	board->cleanup(par);
 err_cmap:
 	fb_dealloc_cmap(&info->cmap);
+err_fbdefio:
+	fb_deferred_io_cleanup(info);
 err_vfree:
 	vfree(videomemory);
 err_fb_rel: