users/chunyang: svn-ls-files: Fix last commit

git-svn-id: https://svn.macports.org/repository/macports/users/chunyang@137630 d073be05-634f-4543-b044-5fe20cf6d1d6

svn-ls-files/svn-ls-files

@@ -9,15 +9,12 @@
 #
 
 function usage {
-    echo "Usage - $0 [PATH]"
+    echo "Usage - $(basename $0) [PATH]"
 }
 
 if [ $# -ne 0 ]; then
-    if cd "$1" &> /dev/null; then
-        ;
-    else
-        usage
-        exit 1
+    if ! cd "$1" &> /dev/null; then
+        usage ; exit 1
     fi
 fi