Fix switch case handling in TLSX_IsGroupSupported function

[Pushyanth-Infineon]

Fix missing break statements in ML-KEM group switch cases causing TLSX_IsGroupSupported() function to return failure even if the group is supported.

Description

In src/tls.c, the function TLSX_IsGroupSupported will return 0 (failure) when:

1. Parameter namedGroup is WOLFSSL_ML_KEM_512 or WOLFSSL_ML_KEM_768 or their hybrid variants.
2. WOLFSSL_NO_ML_KEM_512 and/or WOLFSSL_NO_ML_KEM_768 are not defined and WOLFSSL_NO_ML_KEM_1024 is defined.

In this case the execution will not reach break since it is present inside !WOLFSSL_NO_ML_KEM_1024 code block.

To fix this, add break; at the end of !WOLFSSL_NO_ML_KEM_512 and !WOLFSSL_NO_ML_KEM_768 blocks to handle the flow individually.

Testing

1. Added ML_KEM (ML_KEM768) support in user_settings.h

    #define WOLFSSL_HAVE_MLKEM
    #define WOLFSSL_WC_MLKEM

    #define WOLFSSL_NO_ML_KEM_512
    // #define WOLFSSL_NO_ML_KEM_768
    #define WOLFSSL_NO_ML_KEM_1024

2. Integrated wolfSSL layer into PSoC6 build system and built for TARGET CY8CPROTO-062-4343W board on ModusToolbox™ IDE.
3. TLS1.3 is failing for this configuration, but succeeding if WOLFSSL_NO_ML_KEM_1024 is not defined.
4. Adding break statements individually for each block resolved the issue.

Checklist

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

[wolfSSL-Bot]

Can one of the admins verify this patch?

[dgarske]

Okay to test. Contributor agreement on file.

[Frauschi]

Looks good, thanks for the fix!

[dgarske]

@Pushyanth-Infineon thank you for this fix. Our CI should have caught this, so we are looking into how to better test this edge case.