s390/mm: fixing calls of pte_unmap_unlock

pte_unmap works on page table entry pointers, derefencing should be avoided.
As on s390 pte_unmap is a NOP, this is more a cleanup if we want to supply
later such function.

Signed-off-by: Dominik Dingel <[e-mail]>
Reviewed-by: Thomas Huth <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

arch/s390/mm/pgtable.c

···
 	}
 	pgste_set_unlock(ptep, pgste);
 out_pte:
-	pte_unmap_unlock(*ptep, ptl);
+	pte_unmap_unlock(ptep, ptl);
 }
 EXPORT_SYMBOL_GPL(__gmap_zap);
 
···
 	}
 	if (!(pte_val(*ptep) & _PAGE_INVALID) &&
 	     (pte_val(*ptep) & _PAGE_PROTECT)) {
-		pte_unmap_unlock(*ptep, ptl);
+		pte_unmap_unlock(ptep, ptl);
 		if (fixup_user_fault(current, mm, addr, FAULT_FLAG_WRITE)) {
 			up_read(&mm->mmap_sem);
 			return -EFAULT;
···
 		pgste_val(new) |= PGSTE_UC_BIT;
 
 	pgste_set_unlock(ptep, new);
-	pte_unmap_unlock(*ptep, ptl);
+	pte_unmap_unlock(ptep, ptl);
 	up_read(&mm->mmap_sem);
 	return 0;
 }