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Make linprocfs(4) print a warning when there's not enough room to fill

Description

Make linprocfs(4) print a warning when there's not enough room to fill
/proc/self/maps.

Submitted by: dchagin (earlier version)
Reviewed by: emaste (earlier version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20576

Details