MFC r329845, r329872

r329845:
Fix numerous Coverity issues in mptutil

Most are memory or file descriptor leaks. Three were unannotated
fallthroughs in a switch/case statement. One was an integer overflow before
widen.

Reported by: Coverity
CID: 1007463 1007462 1007461 1007460 1007459 1007458 1007457
CID: 1006855 1006854 1006853 1006852 1006851 1006850 1006849
CID: 1006848 1006845 1006844 1006843 1006842 1006841 1006840
CID: 1006839 1006838 1006837 1006836 1006835 1006834 1006833
CID: 1006832 1006831 1006831 1006830 1006829 1008334 1008170
CID: 1008169 1008168
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D11013

r329872:
Delete copypasta

Reported by: rpokala
X-MFC-With: 329845
Sponsored by: Spectra Logic Corp

Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- Save errno values before calling warn(3) so that errors are correctly
reported.
- Check for malloc() failures.

Submitted by: gcooper
MFC after: 1 week

Add mptutil, a basic utility for managing MPT SCSI/SATA/SAS controllers.
Drive and controller status can be reported, basic attributes changed,
and arrays and spares can be created and deleted.

Approved by: re
Obtained from: Yahoo! Inc.