MDEV-26852 Spider: -Werror=maybe-uninitialized raises on spd_sys_table.cc and ha_spider.cc

The warning "maybe-uninitialized" raises on spd_sys_table.cc and
ha_spider.cc when the sever is compiled with CMAKE_CXX_FLAGS=-Og.

storage/spider/ha_spider.cc

@@ -348,7 +348,7 @@ int ha_spider::open(
     may_be_clone = FALSE;
   ha_spider **pt_handler_share_handlers;
 #ifdef SPIDER_HAS_HASH_VALUE_TYPE
-  my_hash_value_type hash_value;
+  my_hash_value_type hash_value = 0;
 #endif
 #endif
   DBUG_ENTER("ha_spider::open");
@@ -425,7 +425,9 @@ int ha_spider::open(
     partition_handler_share->between_flg = FALSE;
     partition_handler_share->idx_bitmap_is_set = FALSE;
     partition_handler_share->rnd_bitmap_is_set = FALSE;
+#ifdef SPIDER_HAS_HASH_VALUE_TYPE
     partition_handler_share->table_hash_value = hash_value;
+#endif
     partition_handler_share->creator = this;
     partition_handler_share->parallel_search_query_id = 0;
     pt_handler_share_creator = this;

storage/spider/spd_ping_table.cc

@@ -950,12 +950,13 @@ int spider_ping_table_cache_compare(
   char *db_name, *table_name, *link_id;
   DBUG_ENTER("spider_ping_table_cache_compare");
 
-  if (
-    !(db_name = get_field(mem_root, table->field[0])) ||
-    !(table_name = get_field(mem_root, table->field[1])) ||
-    !(link_id = get_field(mem_root, table->field[2]))
-  )
+  if (!(db_name = get_field(mem_root, table->field[0])))
+    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+  if (!(table_name = get_field(mem_root, table->field[1])))
     DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+  if (!(link_id = get_field(mem_root, table->field[2])))
+    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+
   DBUG_PRINT("info", ("spider db_name=%s", db_name));
   DBUG_PRINT("info", ("spider table_name=%s", table_name));
   DBUG_PRINT("info", ("spider link_id=%s", link_id));