Getting number of nvme devices before check if this is
null_block test caused fails.
Signed-off-by: Maciej Wawryk <maciejx.wawryk@intel.com>
Change-Id: I55b0399561ddb11b2f6c36408a56c525e813d239
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3497
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
efd3f83d72