MDEV-20612 fixup: Make comments refer to lock_sys.latch

storage/innobase/include/srv0srv.h

@@ -611,8 +611,7 @@ ibool
 srv_printf_innodb_monitor(
 /*======================*/
 	FILE*	file,		/*!< in: output stream */
-	ibool	nowait,		/*!< in: whether to wait for the
-				lock_sys_t::mutex */
+	ibool	nowait,		/*!< in: whether to wait for lock_sys.latch */
 	ulint*	trx_start,	/*!< out: file position of the start of
 				the list of active transactions */
 	ulint*	trx_end);	/*!< out: file position of the end of

storage/innobase/lock/lock0lock.cc

@@ -459,8 +459,8 @@ static bool lock_rec_validate_page(const buf_block_t *block, bool latched)
 /* The lock system */
 lock_sys_t lock_sys;
 
-/** Only created if !srv_read_only_mode */
-static FILE*		lock_latest_err_file;
+/** Only created if !srv_read_only_mode. Protected by lock_sys.latch. */
+static FILE *lock_latest_err_file;
 
 /*********************************************************************//**
 Reports that a transaction id is insensible, i.e., in the future. */

storage/innobase/srv/srv0srv.cc

@@ -731,8 +731,7 @@ ibool
 srv_printf_innodb_monitor(
 /*======================*/
 	FILE*	file,		/*!< in: output stream */
-	ibool	nowait,		/*!< in: whether to wait for the
-				lock_sys_t:: mutex */
+	ibool	nowait,		/*!< in: whether to wait for lock_sys.latch */
 	ulint*	trx_start_pos,	/*!< out: file position of the start of
 				the list of active transactions */
 	ulint*	trx_end)	/*!< out: file position of the end of