Don't lock timeouts in db_show_callout.
Don't lock timeouts in db_show_callout.

All cpus are stopped and this cpu blocks all interrupts. It doesn't make
sense to grab locks that ddb can then jump past with longjmp.

Noticed by Pierre Riteau. I just forgot about the bug until reminded
today.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars