Fix strange quoting.

src/test/bench/runwisc.sh

 #!/bin/sh
-# $PostgreSQL: pgsql/src/test/bench/runwisc.sh,v 1.8 2004/10/07 22:51:13 momjian Exp $
+# $PostgreSQL: pgsql/src/test/bench/runwisc.sh,v 1.9 2007/08/01 22:24:32 momjian Exp $
 
 if [ ! -d $1 ]; then
         echo " you must specify a valid data directory " >&2
@@ -11,7 +11,7 @@ if [ -d ./obj ]; then
 fi
 
 echo =============== vacuuming benchmark database... ================= >&2
-echo "vacuum" | postgres -D${1} bench > /dev/null
+echo "vacuum" | postgres -D"$1" bench > /dev/null
 
 echo =============== running benchmark... ================= >&2
-time postgres -D${1} -texecutor -tplanner -c log_min_messages=log -c log_destination=stderr -c redirect_stderr=off bench < bench.sql 2>&1
+time postgres -D"$1" -texecutor -tplanner -c log_min_messages=log -c log_destination=stderr -c redirect_stderr=off bench < bench.sql 2>&1