Add null check to wolfSSL_Free

[embhorn]

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Description

If wolfSSL_Free() determines that the ‘heap’ argument is not NULL, it goes on to the ‘else’ statement of memory.c, where it executes the following: 'wc_LockMutex(&(mem->memory_mutex)’ without checking whether ‘mem’ (AKA hint->memory) is NULL.

Fixes zd17779

Testing

Customer confirmed

Checklist

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

[embhorn]

Retest this please

[dgarske]

@embhorn please resolve new conflicts. @JacobBarthelmeh please merge when you are happy with PR.

[embhorn]

retest this please