Maksim Yevmenkin 51713b2a7b Make ng_h4(4) MPSAFE. Use similar to ng_tty(4) locking strategy.
Reconnect ng_h(4) back to the build.

Reviewed by:	kensmith
Approved by:	re (kensmith)
MFC after:	1 month
2007-08-13 17:19:28 +00:00
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