Dynamic memory stored in 'm_requester_cert_chain_buffer' can be lost

[Zhiqiang520]

if add two duplicated parameters --req_cert_chain certchainSample_1.der --req_cert_chain certchainSample_2.der.

1. first time, Dynamic memory stored in m_requester_cert_chain_buffer allocated through function read_input_file at line 606.
   

   spdm-dump/spdm_dump/spdm_dump.c

   Lines 604 to 608 in a4dc28d

   	if (strcmp(argv[0], "--req_cert_chain") == 0) {
   	if (argc >= 2) {
   	res = read_input_file(
   	argv[1], &m_requester_cert_chain_buffer,
   	&m_requester_cert_chain_buffer_size);

2. Continue loop iteration at Line 266, while argc>0 is true.
   

   spdm-dump/spdm_dump/spdm_dump.c

   Lines 266 to 267 in a4dc28d

   	while (argc > 0) {
   	if (strcmp(argv[0], "-r") == 0) {

3. second time, Dynamic memory stored in m_requester_cert_chain_buffer allocated through function read_input_file at line 606,
   then the first time dynamic memory stored in m_requester_cert_chain_buffer is lost.
   

   spdm-dump/spdm_dump/spdm_dump.c

   Lines 604 to 608 in a4dc28d

   	if (strcmp(argv[0], "--req_cert_chain") == 0) {
   	if (argc >= 2) {
   	res = read_input_file(
   	argv[1], &m_requester_cert_chain_buffer,
   	&m_requester_cert_chain_buffer_size);

4. Maybe we should add the following code before Line 606.

    if (m_requester_cert_chain_buffer != NULL) {
        free(m_requester_cert_chain_buffer);
    }

5. The similar case in --rsp_cert_chain side.
   

   spdm-dump/spdm_dump/spdm_dump.c

   Lines 630 to 634 in a4dc28d

   	if (strcmp(argv[0], "--rsp_cert_chain") == 0) {
   	if (argc >= 2) {
   	res = read_input_file(
   	argv[1], &m_responder_cert_chain_buffer,
   	&m_responder_cert_chain_buffer_size);