fix: report read error for device files with -files0-from

[Xylphy]

Fixes #780

Problem
When using -files0-from with a character or block device file that returns EOF immediately (e.g. /dev/vhost-net, /dev/vhost-vsock), the current implementation reads zero bytes and exits successfully with code 0. GNU find, however, detects a read error and fails with a non‑zero exit code and an appropriate error message.

Solution
After reading the file, we now check the file type via its metadata. If the file is a character or block device and the read count is zero, we explicitly treat it as a read error and return a Box<dyn Error> with a descriptive message.

[codspeed-hq]

Merging this PR will improve performance by 11.96%

⚡ 1 improved benchmark
✅ 19 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	printf	36.8 ms	32.9 ms	+11.96%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing Xylphy:fix-files0-from-device-error (d5dbc2d) with main (d19ce8b)}

[github-actions]

Commit 48e6dfe has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 314 / PASSED: 267 / FAILED: 41 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 266 / FAILED: 41 / SKIPPED: 6

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

New test failures (1):
  - gnu/files0_from_ok

Test improvements (1):
  + gnu/okdir_path_empty

[github-actions]

Commit 50de4b8 has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 312 / PASSED: 266 / FAILED: 40 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 266 / FAILED: 41 / SKIPPED: 6

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

Test improvements (1):
  + gnu/okdir_path_empty

[github-actions]

Commit 5f72426 has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 314 / PASSED: 266 / FAILED: 42 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 266 / FAILED: 41 / SKIPPED: 6

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

New test failures (1):
  - gnu/files0_from_ok

[github-actions]

Commit 5a98655 has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 314 / PASSED: 267 / FAILED: 41 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 266 / FAILED: 41 / SKIPPED: 6

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

New test failures (1):
  - gnu/okdir_path_relative

Test improvements (1):
  + gnu/okdir_path_empty

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.88%. Comparing base (d19ce8b) to head (d5dbc2d).

Files with missing lines	Patch %	Lines
src/find/matchers/mod.rs	63.63%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #809      +/-   ##
==========================================
- Coverage   91.93%   91.88%   -0.05%     
==========================================
  Files          35       35              
  Lines        7251     7262      +11     
  Branches      378      380       +2     
==========================================
+ Hits         6666     6673       +7     
- Misses        443      445       +2     
- Partials      142      144       +2     

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[github-actions]

Commit d5dbc2d has test result changes:

bfs testsuite:

Test results comparison:
  Current:   TOTAL: 314 / PASSED: 266 / FAILED: 42 / SKIPPED: 6
  Reference: TOTAL: 313 / PASSED: 266 / FAILED: 41 / SKIPPED: 6

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

New test failures (1):
  - gnu/files0_from_ok