Fix Coverity issues

os_stub/spdm_device_secret_lib_sample/key_pair.c

@@ -471,6 +471,7 @@ bool libspdm_write_key_pair_info(
                 m_key_pair_info[key_pair_id - 1].assoc_cert_slot_mask =
                     desired_assoc_cert_slot_mask;
             } else {
+                free(cached_key_pair_info);
                 return false;
             }
 

unit_test/spdm_unit_test_common/event_support.c

@@ -136,6 +136,9 @@ void generate_dmtf_event_data(void *buffer, uint8_t *total_bytes, uint32_t event
     case SPDM_DMTF_EVENT_TYPE_CERTIFICATE_CHANGED:
         event_detail_len = SPDM_DMTF_EVENT_TYPE_CERTIFICATE_CHANGED_SIZE;
         break;
+    default:
+        event_detail_len = 0;
+        assert(false);
     }
 
     event_data->event_detail_len = event_detail_len;

unit_test/spdm_unit_test_common/support.c

@@ -107,6 +107,7 @@ bool libspdm_read_input_file(const char *file_name, void **file_data,
     if (temp_result == -1) {
         printf("Unable to open file %s\n", file_name);
         *file_data = NULL;
+        close(fp_in);
         return false;
     } else {
         *file_size = (size_t)temp_result;