markj 4476e82765 Refactor some of the MI kernel dump code in preparation for netdump.
- Add clear_dumper() to complement set_dumper().
- Drain netdump's preallocated mbuf pool when clearing the dumper.
- Don't do bounds checking for dumpers with mediasize 0.
- Add dumper callbacks for initialization for writing out headers.

Reviewed by:	sbruno
MFC after:	1 month
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D15252
2018-05-06 00:22:38 +00:00
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