20240930-clang-tidy

[douzzer]

fixes, coddling, and suppressions for new true-positive clang-tidy complaints:

examples/pem/pem.c: fix stdio stream leaks.

src/ssl.c and src/ssl_load.c: suppress concurrency-mt-unsafe around getenv(). getenv() is threadsafe as long as no threads putenv() or setenv().

wolfssl/openssl/asn1.h: add parentheses to fix bugprone-macro-parentheses in ASN1_EX_TEMPLATE_TYPE(), and suppress misfiring bugprone-macro-parentheses around IMPLEMENT_ASN1_FUNCTIONS().

detected and tested with wolfssl-multi-test.sh ... super-quick-check with sys-devel/clang-20.0.0_pre20240924

note new suppression added to wolfssl-multi-test.sh for this:

-    export CLANG_TIDY_PER_FILE_CHECKS='^(src|wolfcrypt)/:concurrency-mt-unsafe ^examples/:-clang-analyzer-unix.Stream ^wolfcrypt/src/sp_(sm2_)?(arm|c|dsp|x86).*\.c:-readability-redundant-preprocessor,-bugprone-signed-char-misuse'
+    export CLANG_TIDY_PER_FILE_CHECKS='^(src|wolfcrypt)/:concurrency-mt-unsafe ^examples/:-clang-analyzer-unix.Stream,-clang-analyzer-unix.StdCLibraryFunctions ^tests/api\.c:-clang-analyzer-unix.StdCLibraryFunctions ^wolfcrypt/src/sp_(sm2_)?(arm|c|dsp|x86).*\.c:-readability-redundant-preprocessor,-bugprone-signed-char-misuse'

see also llvm/llvm-project#110551

[SparkiDev]

retest this please