Testing: Fix HMAC unit test issue

[padelsbach]

Description

Fix for this issue, observed locally:

ERROR - tests/api/test_tls_bounds.c line 842 failed with:
    expected: ssl->hmac(ssl, digest, in, 50, 0, application_data, 1, PEER_ORDER) == (BAD_FUNC_ARG)
    result:   0 != -173

with the following build config:

./configure --disable-shared \
    --enable-swdev --enable-cryptocb \
    CPPFLAGS=-DWOLF_CRYPTO_CB_ONLY_SHA256

Note that CI does not build with this config, so it is not observed there.

Testing

Local testing

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• gcc-arm-cortex-m0plus
• gcc-arm-cortex-m3
• gcc-arm-cortex-m4
• gcc-arm-cortex-m4-baremetal
• gcc-arm-cortex-m4-crypto-only
• gcc-arm-cortex-m4-dtls13
• gcc-arm-cortex-m4-min-ecc
• gcc-arm-cortex-m4-openssl-compat
• gcc-arm-cortex-m4-pkcs7
• gcc-arm-cortex-m4-pq
• gcc-arm-cortex-m4-rsa-only
• gcc-arm-cortex-m4-sp-math
• gcc-arm-cortex-m4-tls12
• gcc-arm-cortex-m4-tls13
• gcc-arm-cortex-m7
• gcc-arm-cortex-m7-pq
• gcc-arm-cortex-m7-tls13
• linuxkm-pie
• linuxkm-standard
• stm32-sim-stm32h753