tcm_node: tidy up once-used variables
tcm_node: tidy up once-used variables

tmp_params and dev_params are only used once, so they can be combined.

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

Datera/lio-utils,Datera/lio-utils,Datera/lio-utils,Datera/lio-utils