mm/hugetlb: simplify the code when alloc_huge_page() failed in hugetlb_no_page()

Rework the error handling code when alloc_huge_page() failed to remove
some duplicated code and simplify the code slightly.

Link: https://lkml.kernel.org/r/20210308112809.26107-5-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb.c

@@ -4395,13 +4395,10 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 			 * sure there really is no pte entry.
 			 */
 			ptl = huge_pte_lock(h, mm, ptep);
-			if (!huge_pte_none(huge_ptep_get(ptep))) {
-				ret = 0;
-				spin_unlock(ptl);
-				goto out;
-			}
+			ret = 0;
+			if (huge_pte_none(huge_ptep_get(ptep)))
+				ret = vmf_error(PTR_ERR(page));
 			spin_unlock(ptl);
-			ret = vmf_error(PTR_ERR(page));
 			goto out;
 		}
 		clear_huge_page(page, address, pages_per_huge_page(h));