mm/memremap: fix missing call to untrack_pfn() in pagemap_range()

We forget to call untrack_pfn() to pair with track_pfn_remap() when range
is not allowed to hotplug.  Fix it by jump err_kasan.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: bca3fea ("mm/memory_hotplug: prevalidate the address range being added with platform")
Signed-off-by: Miaohe Lin <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Acked-by: Muchun Song <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: MiaoheLin

mm/memremap.c

@@ -214,7 +214,7 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
 
 	if (!mhp_range_allowed(range->start, range_len(range), !is_private)) {
 		error = -EINVAL;
-		goto err_pfn_remap;
+		goto err_kasan;
 	}
 
 	mem_hotplug_begin();