Nullness: Annotate nullptr_t conversions (fix #2)
Nullness: Annotate nullptr_t conversions (fix #2)

I previously tried to annotate the nullptr_t itself, like a total jerk! This,
of course, annotates the implicit conversions to real pointer types.

vbuaraujo/quala,sampsyo/quala,vbuaraujo/quala,vbuaraujo/quala,sampsyo/quala