main: Correct first argument type of schedule_delayed_work.

schedule_delayed_work expects an argument of type "pointer to
delayed_work struct" but had previously been supplied with a
"pointer to work_struct" possibly due to an extinct API reference.

Also fix a "WARNING: modpost: Found 1 section mismatch(es)"

Signed-off-by: Salym Senyonga <salymsash@gmail.com>