[#MDEV-28301] Spider: Fix GCC warnings, comparing the result of pointer addition ... and NULL

/mariadb/10.9/storage/spider/spd_db_mysql.cc: In member function 'virtual int spider_db_mbase::append_lock_tables(spider_string*)':

/mariadb/10.9/storage/spider/spd_db_mysql.cc:3722:9: error: comparing the result of pointer addition '(db_share->spider_mbase_share::db_names_str + ((sizetype)(conn_link_idx * 52)))' and NULL [-Werror=address]

 3722 |     if (&db_share->db_names_str[conn_link_idx])

      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

/mariadb/10.9/storage/spider/spd_db_mysql.cc:3732:9: error: comparing the result of pointer addition '(db_share->spider_mbase_share::table_names_str + ((sizetype)(conn_link_idx * 52)))' and NULL [-Werror=address]

 3732 |     if (&db_share->table_names_str[conn_link_idx])

      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The current affect (or fix) version, 10.9, might not be correct. Check the older versions too.

[MDEV-28301] Spider: Fix GCC warnings, comparing the result of pointer addition ... and NULL Created: 2022-04-12 Updated: 2022-05-23 Resolved: 2022-05-13
Status:	Closed
Project:	MariaDB Server
Component/s:	Storage Engine - Spider
Affects Version/s:	10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8
Fix Version/s:	10.3.35, 10.4.25, 10.5.16, 10.6.8, 10.7.4, 10.8.3, 10.9.1

[MDEV-28301] Spider: Fix GCC warnings, comparing the result of pointer addition ... and NULL Created: 2022-04-12 Updated: 2022-05-23 Resolved: 2022-05-13