Fix commitcheck on FreeBSD

[ghost]

Convert from bash to sh, avoid Perl regexes and \s, prune unused
functions.

Signed-off-by: Ryan Moeller [email protected]

Motivation and Context

Description

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[codecov]

Codecov Report

Merging #11070 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11070      +/-   ##
==========================================
+ Coverage   79.67%   79.76%   +0.09%     
==========================================
  Files         397      397              
  Lines      125756   125756              
==========================================
+ Hits       100191   100308     +117     
+ Misses      25565    25448     -117     

Flag	Coverage Δ
#kernel	80.42% <ø> (-0.03%)	⬇️
#user	65.94% <ø> (+0.37%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
module/zfs/dsl_synctask.c	92.30% <0.00%> (-2.57%)	⬇️
module/zfs/zio_compress.c	92.72% <0.00%> (-1.82%)	⬇️
lib/libzfs/libzfs_changelist.c	85.18% <0.00%> (-1.12%)	⬇️
module/zfs/vdev_removal.c	96.49% <0.00%> (-0.80%)	⬇️
module/zfs/zio_checksum.c	98.31% <0.00%> (-0.57%)	⬇️
module/zfs/space_map.c	93.17% <0.00%> (-0.49%)	⬇️
module/zfs/vdev_indirect_mapping.c	98.55% <0.00%> (-0.49%)	⬇️
module/os/linux/zfs/zpl_xattr.c	83.89% <0.00%> (-0.43%)	⬇️
module/zfs/dmu_traverse.c	96.34% <0.00%> (-0.34%)	⬇️
module/lua/lauxlib.c	60.30% <0.00%> (-0.31%)	⬇️
... and 52 more

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