Fixed heap-overflow if compiled with `--enable-tls-sigs`. #2796

Job	Run time
Python Bindings (ubuntu-latest)	1m 17s
Test Utils (ubuntu-latest)	2m 38s
ubuntu-latest x86_64 --with-local-libgcrypt cc	6m 54s
ubuntu-latest x86_64 cc	6m 5s
ubuntu-20.04 x86_64 --with-local-libgcrypt cc	6m 25s
ubuntu-20.04 x86_64 cc	5m 50s
macOS-latest x86_64 --with-local-libgcrypt cc	4m 41s
macOS-latest x86_64 cc	5m 38s
macos-11 x86_64 --with-local-libgcrypt cc	5m 38s
macos-11 x86_64 cc	5m 11s
windows-latest x86_64 --with-local-libgcrypt cc	21m 44s
windows-latest x86_64 cc	7m 6s
ubuntu-20.04 x86_64 gcc-7 --with-pcre --with-maxminddb --with-sanitizer	9m 48s
ubuntu-22.04 x86_64 gcc-12 --with-pcre --with-maxminddb --with-sanitizer --with-lto-and-gold-linker	10m 35s
ubuntu-20.04 x86_64 clang-7 --with-pcre --with-maxminddb --with-sanitizer	12m 8s
ubuntu-22.04 x86_64 clang-14 --with-pcre --with-maxminddb --with-sanitizer --with-lto-and-gold-linker	14m 27s
ubuntu-latest x86_64 cc --with-pcre --with-maxminddb --with-thread-sanitizer	20m 9s
ubuntu-latest x86_64 cc --with-pcre --with-maxminddb --with-sanitizer nBPF	6m 42s
ubuntu-22.04 x86_64 clang-14 --with-pcre --with-maxminddb --with-memory-sanitizer	14m 4s
macOS-latest x86_64 cc --with-pcre --with-maxminddb	5m 15s
macos-12 x86_64 cc --with-pcre --with-maxminddb	5m 5s
ubuntu-latest arm64 cc --with-pcre --with-maxminddb	23m 13s
ubuntu-latest armhf cc --with-pcre --with-maxminddb --with-sanitizer	51m 8s
ubuntu-latest s390x cc --with-pcre --with-maxminddb	22m 46s
	4h 34m 27s

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