mmap MAP_FAILED audit.

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of im

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of improvements from upstream,
this version also has these NetBSD-specific enhancements:
- dtrace FBT probes can now be placed in kernel modules.
- ZFS now supports mmap().

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Fix some snprintf

Add missing 3rd argument of nicenum

kill sprintf

Merge NetBSD local changes to new zfs version 22 sources.

Revert my last wrong change this will need more work.

On i386 use 32bit version of atomic_add_op because 64 doesn't work on
i486 userland.

Import Opensolaris source code used with zfs port. Zfs code si from date
200811.