Revert part of MDEV-12113

commit 1af8bf39 added unnecessary
calls to fil_write_flushed_lsn() during redo log resizing at
InnoDB server startup.

Because fil_write_flushed_lsn() is neither redo-logged nor doublewrite
buffered, the call is risky and should be avoided, because if the
server killed during the write call, the whole InnoDB instance can
become inaccessible (corrupted page 0 in the system tablespace).

In the best case, this call might prevent a diagnostic message from
being emitted to the error log on the next startup.

storage/innobase/srv/srv0start.cc

@@ -2766,17 +2766,8 @@ innobase_start_or_create_for_mysql(void)
 				return(err);
 			}
 
-			/* create_log_files() can increase system lsn that is
-			why FIL_PAGE_FILE_FLUSH_LSN have to be updated */
-			flushed_lsn = log_get_lsn();
-
-			err = fil_write_flushed_lsn(flushed_lsn);
-
-			if (err == DB_SUCCESS) {
-				err = create_log_files_rename(
-					logfilename, dirnamelen,
-					flushed_lsn, logfile0);
-			}
+			err = create_log_files_rename(logfilename, dirnamelen,
+						      log_get_lsn(), logfile0);
 
 			if (err != DB_SUCCESS) {
 				return(err);

storage/xtradb/srv/srv0start.cc

@@ -2852,16 +2852,6 @@ innobase_start_or_create_for_mysql(void)
 				return(err);
 			}
 
-			/* create_log_files() can increase system lsn that is
-			why FIL_PAGE_FILE_FLUSH_LSN have to be updated */
-			flushed_lsn = log_get_lsn();
-
-			err = fil_write_flushed_lsn(flushed_lsn);
-
-			if (err != DB_SUCCESS) {
-				return(err);
-			}
-
 			err = create_log_files_rename(logfilename, dirnamelen,
 						      log_get_lsn(), logfile0);