locate, updatedb, xargs: avoid panic on a non-UTF-8 argument

[AbhinavMir]

#767

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.31%. Comparing base (fe25054) to head (f3fa654).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
+ Coverage   92.29%   92.31%   +0.02%     
==========================================
  Files          35       35              
  Lines        7445     7466      +21     
  Branches      388      388              
==========================================
+ Hits         6871     6892      +21     
  Misses        433      433              
  Partials      141      141              

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[github-actions]

Commit f3fa654 has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 316 / PASSED: 273 / FAILED: 37 / SKIPPED: 6
  Reference: TOTAL: 317 / PASSED: 274 / FAILED: 37 / SKIPPED: 6

Changes from main branch:
  TOTAL: -1
  PASSED: -1
  FAILED: +0

No result in this run (1) - hung, crashed, or renamed:
  ? gnu/executable (was PASS)

[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

---

_{Comparing AbhinavMir:non-utf8-args-no-panic (f3fa654) with main (fe25054)¹}

Footnotes

1. No successful run was found on main (05752b8) during the generation of this report, so fe25054 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩