bdevperf: avoid using of out of boundary indices

This patch corrects patch 17176, which doesn't
corectly addresses issue found by Klocwork scan.
Both indices, k and i, needs to be verified here,
as both *filename and *out has limited size.
As the 'k' index is incremented inside the loop,
the loop entry condition for k index must be set to
k < (BDEVPERF_CONFIG_MAX_FILENAME - 1) not to
k < BDEVPERF_CONFIG_MAX_FILENAME,
to avoid situation where i and k are both equal to
BDEVPERF_CONFIG_MAX_FILENAME - 1, 'for' loop pass
is therefore executed, and inside the loop k is
incremented (so it is set to
k=BDEVPERF_CONFIG_MAX_FILENAME) giving in result
out of boundary index for *out table in line:
out[k] = 0;

Change-Id: Idf62c40f86f3aa4c8c6372bc74e94703925de47e
Signed-off-by: Marcin Spiewak <marcin.spiewak@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/18135


Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot