Dtls13HashClientHello(): fix wc_HashType handling;
Dtls13SendFragment(): fix identicalConditionAfterEarlyExit;
GetDtlsRecordHeader(): fix error handling around GetDtls13RecordHeader() (incorrectLogicOperator);
test_wolfSSL_dtls_stateless_maxfrag(): fix a clang-analyzer-core.NullDereference,
test_dtls_frag_ch(): fix a clang-diagnostic-embedded-directive,
test_AEAD_limit_client(): fix an united-data defect found by valgrind.