features/shard: Fix incorrect parameter to get_lowest_block()

        Backport of: http://review.gluster.org/10804

Due to get_lowest_block() being a macro, what needs to be passed
to it is the evaluation of the expression (local->offset - 1), without
which its substitution can cause junk values to be assigned to
local->first_block.

This patch also fixes calls to get_highest_block() where if offset and
size are both equal to zero, it could return negative values.

Change-Id: I8f1bc54b536587d6af3a5c193434d06dccbf76dc
BUG: 1227572
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: http://review.gluster.org/11051
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

0 files changed, 0 insertions, 0 deletions