chores: fix 32bit build with -Wconversion

[Gottox]

Addresses #280

[codecov]

Codecov Report

Attention: Patch coverage is 73.40426% with 25 lines in your changes missing coverage. Please review.

Project coverage is 64.62%. Comparing base (2566f85) to head (1f59646).

Files	Patch %	Lines
libsqsh/src/easy/file.c	69.56%	4 Missing and 3 partials ⚠️
libsqsh/src/mapper/mapper.c	50.00%	4 Missing and 1 partial ⚠️
libsqsh/src/file/file_iterator.c	69.23%	4 Missing ⚠️
libsqsh/src/file/file.c	57.14%	2 Missing and 1 partial ⚠️
libsqsh/src/mapper/map_slice.c	50.00%	1 Missing and 1 partial ⚠️
tools/src/stat.c	0.00%	2 Missing ⚠️
libsqsh/src/archive/trailing_context.c	0.00%	1 Missing ⚠️
libsqsh/src/table/export_table.c	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
- Coverage   64.75%   64.62%   -0.13%     
==========================================
  Files          74       74              
  Lines        5541     5578      +37     
  Branches      833      840       +7     
==========================================
+ Hits         3588     3605      +17     
- Misses       1471     1485      +14     
- Partials      482      488       +6     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
10 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud