MDEV-40340 mariadb-import --lock-tables crashes

don't change `argv` pointer, it's needed later for --lock-tables

Author: vuvova

client/mysqlimport.cc

@@ -1314,9 +1314,9 @@ int main(int argc, char **argv)
   }
   else
   {
-    for (; *argv != NULL; argv++)
+    for (char **t=argv; *t != NULL; t++)
     {
-      table_load_params p(*argv, "", current_db, 0);
+      table_load_params p(*t, "", current_db, 0);
       files_to_load.push_back(p);
     }
   }

mysql-test/main/mysqldump.test

@@ -3227,7 +3227,7 @@ drop table db2.t1;
 --exec $MYSQL db1 < $MYSQLTEST_VARDIR/tmp/dump/db1/t1.sql
 --exec $MYSQL db2 < $MYSQLTEST_VARDIR/tmp/dump/db2/t1.sql
 --exec $MYSQL_IMPORT --silent db1 $MYSQLTEST_VARDIR/tmp/dump/db1/t1.txt
---exec $MYSQL_IMPORT --silent db2 $MYSQLTEST_VARDIR/tmp/dump/db2/t1.txt
+--exec $MYSQL_IMPORT --lock-tables --silent db2 $MYSQLTEST_VARDIR/tmp/dump/db2/t1.txt
 select * from db1.t1;
 select * from db2.t1;
 drop database db1;