Fixed mysql_install_db.sh

scripts/mysql_install_db.sh:
  Added missing variable

scripts/mysql_install_db.sh

@@ -59,6 +59,7 @@ do
          # This could easily be rewritten to gather [xxxxx]-specific entries,
          # but for now it looks like only the mysqld ones are needed for
          # server startup scripts
+         thevar=""
          eval `sed -n -e '/^$/d' -e '/^#/d' -e 's,[ 	],,g' -e '/=/p' $c |\
          awk -F= -v v=$v '{if ($1 == v) printf ("thevar=\"%s\"\n", $2)}'`