s390/mm: Fix cmma unused transfer from pgste into pte

s390/mm: Fix cmma unused transfer from pgste into pte

commit 0d6da872d3e4a60f43c295386d7ff9a4cdcd57e9 upstream.

The last pgtable rework silently disabled the CMMA unused state by
setting a local pte variable (a parameter) instead of propagating it
back into the caller. Fix it.

Fixes: ebde765c0e85 ("s390/mm: uninline ptep_xxx functions from pgtable.h")
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>