nvme/{003,004,005,013,046,049}: Group all variables declarations

nvme/{003,004,005,013,046,049}: Group all variables declarations

Group all variable declarations together at the beginning of the
function. Many of the nvme tests do this but not all. Thus make these
tests use the same style. This allows to spot the odd balls in the
refactoring of the tests.

Signed-off-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>