style change: explicitly permit braces for single statements

[Luke Mewburn <lukem%NetBSD.org@localhost>]

I propose that the NetBSD C style guide in to /usr/share/misc/style
is reworded to more explicitly permit braces around single statements,
instead of the current discourgement.

IMHO, permitting braces to be consistently used:
- Adds to clarity of intent.
- Aids code review.
- Avoids gotofail: https://en.wikipedia.org/wiki/Unreachable_code#goto_fail_bug

regards,
Luke.

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