lockdep: Fix wait-type for empty stack

Even the very first lock can violate the wait-context check, consider
the various IRQ contexts.

Fixes: de8f5e4f ("lockdep: Introduce wait-type checks")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20210617190313.256987481@infradead.org