MDEV-11505 wrong databasename in mysqldump comment

fix_for_comment() uses a static buffer. cannot have two
fix_for_comment() calls as arguments to one printf().

client/mysqldump.c

@@ -670,8 +670,9 @@ static void write_header(FILE *sql_file, char *db_name)
                   "-- MySQL dump %s  Distrib %s, for %s (%s)\n--\n",
                   DUMP_VERSION, MYSQL_SERVER_VERSION, SYSTEM_TYPE,
                   MACHINE_TYPE);
-    print_comment(sql_file, 0, "-- Host: %s    Database: %s\n",
-                  fix_for_comment(current_host ? current_host : "localhost"),
+    print_comment(sql_file, 0, "-- Host: %s    ",
+                  fix_for_comment(current_host ? current_host : "localhost"));
+    print_comment(sql_file, 0, "Database: %s\n",
                   fix_for_comment(db_name ? db_name : ""));
     print_comment(sql_file, 0,
                   "-- ------------------------------------------------------\n"

mysql-test/t/mysqldump.test

@@ -2509,3 +2509,11 @@ if (`select convert(@@version_compile_os using latin1) IN ("Win32","Win64","Wind
 }
 --exec $MYSQL_DUMP --routines --compact $shell_ready_db_name
 DROP DATABASE `a\"'``b`;
+
+#"
+# MDEV-11505 wrong databasename in mysqldump comment
+#
+let SEARCH_FILE=$MYSQLTEST_VARDIR/tmp/bug11505.sql;
+let SEARCH_PATTERN=Database: mysql;
+exec $MYSQL_DUMP mysql func  > $SEARCH_FILE;
+source include/search_pattern_in_file.inc;