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test: do not use uninitialized memory in common flags check

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/common-flag-check-uninitialized into master

Only use the amount of data that was actually read from the test file. Otherwise, there is a small risk of getting false positives, and generally reading uninitialized memory makes using automated memory error detection tools harder.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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