tcmu-runner: simplify format unit io limit check
tcmu-runner: simplify format unit io limit check

done_blocks is always zero here, because we just allocated the state
struct. Just drop it from the check.

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

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