Initialize read_descriptor command to avoid sending uninitialized values in the PDU (clang-analyze warning)
Clear aem_cmd_read_desc_resp before parsing. Not really a problem but clang analyzer complained..
aem_cmd_entity_avail and aecp_cmd_aa_header needed to be cleared to avoid clang analyzer saying that packet (reserved field) is garbage.
Fixed more uninitialized variable warnings from clang-analyzer.
updated jdksavdecc-c submodule to lastest master branch