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if_tuntap: minor improvements

Description

if_tuntap: minor improvements

Rewrite a loop to avoid duplicating the exit condition.
Simplify mask processing in tunpoll().
Fix minor typos.

Reviewed by: kevans, markj
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D21302

Details

Provenance
vmaffioneAuthored on
Reviewer
kevans
Differential Revision
D21302: if_tuntap: minor improvements
Parents
rS351219: Fix netdump buffering after r348473.
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