MDEV-24609: innodb_io_capacity can exceed innodb_io_capacity_max

innodb_io_capacity_update(): When the requested innodb_io_capacity
exceeds innodb_io_capacity_max and is more than half the maximum,
do not double it for computing innodb_io_capacity_max.

This integer arithmetics overflow was introduced in
commit 0f32299 (MDEV-7035).

No test case is added, because sizeof(ulong) varies between platforms.

storage/innobase/handler/ha_innodb.cc

@@ -17532,7 +17532,8 @@ innodb_io_capacity_update(
 				    " higher than innodb_io_capacity_max %lu",
 				    in_val, srv_max_io_capacity);
 
-		srv_max_io_capacity = in_val * 2;
+		srv_max_io_capacity = (in_val & ~(~0UL >> 1))
+			? in_val : in_val * 2;
 
 		push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
 				    ER_WRONG_ARGUMENTS,