cleanup tcmu_get_runner_handler
cleanup tcmu_get_runner_handler

No need to cast from a void pointer. Follow coding style
above it.

Signed-off-by: Mike Christie <39daeb1549a929782e38aa87c4e3da7f3844b09a@redhat.com>

lxbsz/tcmu-runner,open-iscsi/tcmu-runner,agrover/tcmu-runner,open-iscsi/tcmu-runner,liuy/tcmu-runner