yajl: fix memory leak problem

reason: fix memory leak problem
(cherry picked from commit 3d65cb0
 in https://github.com/openEuler-BaseService)

Fixes: lloyd#250  (CVE-2023-33460)

src/yajl_tree.c

@@ -143,7 +143,7 @@ static yajl_val context_pop(context_t *ctx)
     ctx->stack = stack->next;
 
     v = stack->value;
-
+    free (stack->key);
     free (stack);
 
     return (v);
@@ -444,6 +444,10 @@ yajl_val yajl_tree_parse (const char *input,
              snprintf(error_buffer, error_buffer_size, "%s", internal_err_str);
              YA_FREE(&(handle->alloc), internal_err_str);
         }
+        while(ctx.stack != NULL) {
+             yajl_val v = context_pop(&ctx);
+             yajl_tree_free(v);
+        }
         yajl_free (handle);
         return NULL;
     }