Fix install error introduced by #9089

[pcd1193182]

Signed-off-by: Paul Dagnelie [email protected]

Motivation and Context

When attempting to load zfs bits onto a machine that already has had zfs bits loaded onto it, an error occurs when trying to symlink the zfs-import.service file

Description

Use ln -sf to force the symlink if the file already exists

How Has This Been Tested?

building and loading the zfs repository onto a vm that already has had the zfs repository built and loaded on it.

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.
• All new and existing tests passed.
• All commit messages are properly formatted and contain Signed-off-by.

[pcd1193182]

@c0d3z3r0 I couldn't tag you as a reviewer but if you could take a look I'd appreciate it.

[tonynguien]

Thanks for fixing this issue.

[c0d3z3r0]

lgtm; thanks for this fix!

[codecov]

Codecov Report

Merging #9205 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9205      +/-   ##
==========================================
+ Coverage   79.18%    79.3%   +0.11%     
==========================================
  Files         400      400              
  Lines      122002   122002              
==========================================
+ Hits        96607    96753     +146     
+ Misses      25395    25249     -146

Flag	Coverage Δ
#kernel	79.83% <ø> (+0.09%)	⬆️
#user	67.34% <ø> (+0.41%)	⬆️

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