uml: Fix order of pud and pmd_free()

If pmd_alloc() fails we should only free the prior allocated pud, if pte_alloc_map() fails, we should free pmd as well.

---

index 0cd9a7a..8bfd1e9 100644
@@ -38,10 +38,10 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
 	*pte = pte_mkread(*pte);
 	return 0;
 
- out_pmd:
-	pud_free(mm, pud);
  out_pte:
 	pmd_free(mm, pmd);
+ out_pmd:
+	pud_free(mm, pud);
  out:
 	return -ENOMEM;
 }

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