Fix zlib leak on FreeBSD

[ghost]

Motivation and Context

Fixes #10225

zlib_inflateEnd was accidentally a wrapper for inflateInit instead of
inflateEnd, and hilarity ensues.

Description

Fix the typo so we free memory instead of allocating more.

How Has This Been Tested?

I made sure it builds.

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 ZFS on Linux 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-io]

Codecov Report

Merging #10252 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10252      +/-   ##
==========================================
+ Coverage   79.28%   79.42%   +0.13%     
==========================================
  Files         389      389              
  Lines      123046   123046              
==========================================
+ Hits        97559    97724     +165     
+ Misses      25487    25322     -165     

Flag	Coverage Δ
#kernel	79.88% <ø> (-0.02%)	⬇️
#user	66.13% <ø> (+1.24%)	⬆️

Impacted Files	Coverage Δ
module/os/linux/spl/spl-zlib.c	55.35% <0.00%> (-28.58%)	⬇️
module/zcommon/zfs_fletcher.c	75.65% <0.00%> (-2.64%)	⬇️
module/zfs/zil.c	91.33% <0.00%> (-2.03%)	⬇️
cmd/zed/agents/fmd_api.c	88.61% <0.00%> (-1.78%)	⬇️
module/zfs/zrlock.c	89.23% <0.00%> (-1.54%)	⬇️
cmd/zed/agents/zfs_diagnosis.c	77.55% <0.00%> (-1.17%)	⬇️
module/zfs/spa_log_spacemap.c	93.40% <0.00%> (-1.15%)	⬇️
cmd/zed/agents/fmd_serd.c	78.21% <0.00%> (-1.00%)	⬇️
module/zfs/dmu_traverse.c	96.01% <0.00%> (-0.67%)	⬇️
lib/libzutil/os/linux/zutil_import_os.c	78.07% <0.00%> (-0.67%)	⬇️
... and 59 more

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