fixed remove multiple leading slashes

Author: fbuescher

support/rrsync

@@ -300,6 +300,7 @@ def validated_arg(opt, arg, typ=3, wild=False):
     if arg.startswith('./'):
         arg = arg[1:]
     arg = arg.replace('//', '/')
+    arg = arg.lstrip('/')
     if args.dir != '/':
         if HAS_DOT_DOT_RE.search(arg):
             die("do not use .. in", opt, "(anchor the path at the root of your restricted dir)")