[PATCH 3.9.y] s390: Add pgste to ptep_modify_prot_start()

[Ben Hutchings]

Commit 52f36be0f4e2 's390/pgtable: Fix check for pgste/storage key
handling', which was commit b56433cb782d upstream, added a use of
pgste to ptep_modify_prot_start(), but this variable does not exist.
In mainline, pgste was added by commit d3383632d4e8 's390/mm: add pte
invalidation notifier for kvm' and initialised to the return value of
pgste_get_lock(ptep).  Initialise it similarly here.

Compile-tested only.

Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1063,11 +1063,12 @@ static inline pte_t ptep_modify_prot_sta
                                           unsigned long address,
                                           pte_t *ptep)
 {
+       pgste_t pgste;
        pte_t pte;
 
        mm->context.flush_mm = 1;
        if (mm_has_pgste(mm))
-               pgste_get_lock(ptep);
+               pgste = pgste_get_lock(ptep);
 
        pte = *ptep;
        if (!mm_exclusive(mm))

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