drivers/video/xen-fbfront.c: add missing cleanup code

The operations in the subsequent error-handling code appear to be also
useful here.
Acked-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
[v1: Collapse some of the error handling functions]
[v2: Fix compile warning]
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/video/xen-fbfront.c

@@ -365,7 +365,7 @@ static int __devinit xenfb_probe(struct xenbus_device *dev,
 	struct fb_info *fb_info;
 	int fb_size;
 	int val;
-	int ret;
+	int ret = 0;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (info == NULL) {
@@ -458,26 +458,31 @@ static int __devinit xenfb_probe(struct xenbus_device *dev,
 	xenfb_init_shared_page(info, fb_info);
 
 	ret = xenfb_connect_backend(dev, info);
-	if (ret < 0)
-		goto error;
+	if (ret < 0) {
+		xenbus_dev_fatal(dev, ret, "xenfb_connect_backend");
+		goto error_fb;
+	}
 
 	ret = register_framebuffer(fb_info);
 	if (ret) {
-		fb_deferred_io_cleanup(fb_info);
-		fb_dealloc_cmap(&fb_info->cmap);
-		framebuffer_release(fb_info);
 		xenbus_dev_fatal(dev, ret, "register_framebuffer");
-		goto error;
+		goto error_fb;
 	}
 	info->fb_info = fb_info;
 
 	xenfb_make_preferred_console();
 	return 0;
 
- error_nomem:
-	ret = -ENOMEM;
-	xenbus_dev_fatal(dev, ret, "allocating device memory");
- error:
+error_fb:
+	fb_deferred_io_cleanup(fb_info);
+	fb_dealloc_cmap(&fb_info->cmap);
+	framebuffer_release(fb_info);
+error_nomem:
+	if (!ret) {
+		ret = -ENOMEM;
+		xenbus_dev_fatal(dev, ret, "allocating device memory");
+	}
+error:
 	xenfb_remove(dev);
 	return ret;
 }