fbdev: xenfb: Use vmalloc_array to simplify code

Use vmalloc_array() instead of vmalloc() to simplify the function
xenfb_probe().

Signed-off-by: Qianfeng Rong <[email protected]>
Signed-off-by: Helge Deller <[email protected]>

Author: qianfengrong

drivers/video/fbdev/xen-fbfront.c

@@ -390,7 +390,7 @@ static int xenfb_probe(struct xenbus_device *dev,
 
 	info->nr_pages = (fb_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
-	info->gfns = vmalloc(array_size(sizeof(unsigned long), info->nr_pages));
+	info->gfns = vmalloc_array(info->nr_pages, sizeof(unsigned long));
 	if (!info->gfns)
 		goto error_nomem;