Fix a double-free bug.

In the dlt_config_file_set_section function of dlt_config_file_parser.c:
  s-name is not set to null after free.
  It will be freed again in the dlt_config_file_release function.

Signed-off-by: Zhongyang.Bao <Zhongyang.Bao@zeekrlife.com>

src/shared/dlt_config_file_parser.c

@@ -148,6 +148,7 @@ static int dlt_config_file_set_section(DltConfigFile *file, char *name)
 
     if (s->keys == NULL) {
         free(s->name);
+        s->name = NULL;
         dlt_log(LOG_ERR, "Cannot allocate memory for internal data structure\n");
         return -1;
     }