mm/page_vma_mapped.c: use helper function huge_pte_lock

Use helper function huge_pte_lock() to lock the huge pte to simplify the
code a bit.  No functional change intended.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Miaohe Lin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: MiaoheLin

mm/page_vma_mapped.c

@@ -174,8 +174,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 		if (!pvmw->pte)
 			return false;
 
-		pvmw->ptl = huge_pte_lockptr(hstate, mm, pvmw->pte);
-		spin_lock(pvmw->ptl);
+		pvmw->ptl = huge_pte_lock(hstate, mm, pvmw->pte);
 		if (!check_pte(pvmw))
 			return not_found(pvmw);
 		return true;