mm/huge_memory.c: remove unnecessary local variable ret2

There is no need to use a new local variable ret2 to get the return
value of handle_userfault().  Use ret directly to make code more
succinct.

Link: https://lkml.kernel.org/r/20210210072409.60587-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
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/huge_memory.c

@@ -624,14 +624,12 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
 
 		/* Deliver the page fault to userland */
 		if (userfaultfd_missing(vma)) {
-			vm_fault_t ret2;
-
 			spin_unlock(vmf->ptl);
 			put_page(page);
 			pte_free(vma->vm_mm, pgtable);
-			ret2 = handle_userfault(vmf, VM_UFFD_MISSING);
-			VM_BUG_ON(ret2 & VM_FAULT_FALLBACK);
-			return ret2;
+			ret = handle_userfault(vmf, VM_UFFD_MISSING);
+			VM_BUG_ON(ret & VM_FAULT_FALLBACK);
+			return ret;
 		}
 
 		entry = mk_huge_pmd(page, vma->vm_page_prot);