libtests: drop two redundant memset()s

[vszakats]

Reported by clang-tidy bugprone-sizeof-expression.

Silencing:

tests/libtest/cli_h2_pausing.c:164:23: warning: suspicious usage of 'sizeof()' on an expression of pointer type [bugprone-sizeof-expression]
  164 |   memset(&resolve, 0, sizeof(resolve));
      |                       ^
tests/libtest/cli_upload_pausing.c:158:23: warning: suspicious usage of 'sizeof()' on an expression of pointer type [bugprone-sizeof-expression]
  158 |   memset(&resolve, 0, sizeof(resolve));
      |                       ^

Ref: https://clang.llvm.org/extra/clang-tidy/checks/bugprone/sizeof-expression.html

[vszakats]

needs separate fix so that disabling typechecks via autotools/cmake also applies to examples.

This needs passing this option as a CPPFLAGS, instead of using curl_config.h.

[vszakats]

False positive:

/home/runner/work/curl/curl/lib/hostip.c:516:38: error: suspicious usage of 'sizeof(A*)'; pointer to aggregate [bugprone-sizeof-expression,-warnings-as-errors]
  516 |     nodes = curlx_malloc(num_addrs * sizeof(*nodes));
      |                                      ^~~~~~~~~~~~~~
94 warnings generated.
Suppressed 93 warnings (93 in non-user code).

[vszakats]

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[augmentcode]

🤖 Augment PR Summary

Summary: Removes redundant memset()-based pointer zeroing in two libtest CLI tests.

Why: Avoids clang-tidy bugprone-sizeof-expression warnings by relying on the existing resolve = NULL initialization.

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[augmentcode]

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