fix(find): output nothing when -mindepth exceeds -maxdepth

[Jorge-Polanco-Roque]

Fixes #778

Problem

When -mindepth is greater than -maxdepth, find should output nothing (no depth can be both >= mindepth and <= maxdepth), matching GNU find. uutils instead printed the max-depth entries:

$ find . -mindepth 2 -maxdepth 1     # GNU: (nothing)
$ ./find . -mindepth 2 -maxdepth 1   # uutils, before:
./a
./f0

Cause

process_dir passes both bounds to WalkDir::min_depth/max_depth. When min_depth > max_depth, WalkDir does not yield the empty set — it effectively clamps the range and still yields entries at the max depth, so they leak through.

Fix

Short-circuit in process_dir: when config.min_depth > config.max_depth, return early with no output, matching GNU find.

Tests

Adds find_mindepth_greater_than_maxdepth, which asserts empty output for -mindepth 2 -maxdepth 1. It fails without the fix (the max-depth entries are printed) and passes with it. cargo fmt --check and cargo clippy are clean; normal min/max combinations are unaffected.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.33%. Comparing base (d6ae4f9) to head (96ccd56).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
+ Coverage   92.31%   92.33%   +0.01%     
==========================================
  Files          35       35              
  Lines        7466     7485      +19     
  Branches      388      389       +1     
==========================================
+ Hits         6892     6911      +19     
  Misses        433      433              
  Partials      141      141              

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[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

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_{Comparing Jorge-Polanco-Roque:fix/mindepth-exceeds-maxdepth (96ccd56) with main (d6ae4f9)}

[sylvestre]

please add a test in tests/test_find.rs too :)