reject stream read errors in yyjson_read_fp

[two-heart]

Fixes #296

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.45%. Comparing base (db37a64) to head (0d29eed).

Files with missing lines	Patch %	Lines
src/yyjson.c	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #297      +/-   ##
==========================================
- Coverage   98.47%   98.45%   -0.03%     
==========================================
  Files           2        2              
  Lines        7743     7745       +2     
==========================================
  Hits         7625     7625              
- Misses        118      120       +2     

Flag	Coverage Δ
unittests	98.45% <0.00%> (-0.03%)	⬇️

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[ibireme]

Thanks!