Fix exception store name handling.
We need to reference exception store by zero terminated string.
Fixes regression introduced in commit f6bd4eb73cdf2a5bf954e497972842f39cabb7e3
Cc: Yi Yang <yi.y.yang@intel.com>
Cc: Jonathan Brassow <jbrassow@redhat.com>
Cc: stable@kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
874d2f61d3