nvme/033: Remove volatile output

nvme/033: Remove volatile output

The output of _nvme_discover() will be changed according to
${nvme_trtype} and the number of NICs. For example: nvme/033
with nvme_trtype=tcp and two NICs got the following error:
------------------------------------------------
 Running nvme/033
-Discovery Log Number of Records 1, Generation counter X
+Discovery Log Number of Records 2, Generation counter X
 =====Discovery Log Entry 0======
-trtype:  loop
+trtype:  tcp
+subnqn:  nqn.2014-08.org.nvmexpress.discovery
+=====Discovery Log Entry 1======
+trtype:  tcp
 subnqn:  blktests-subsystem-1
 NQN:blktests-subsystem-1 disconnected 1 controller(s)
 Test complete
------------------------------------------------

Remove volatile output to fix the issue.

Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>