win32/rm.bat: fix infinite loop

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38763 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2013-01-10 08:44:19 +00:00 · 2013-01-10 08:44:19 +00:00 · b7b183f682
--- a/win32/rm.bat
+++ b/win32/rm.bat
@ -1,7 +1,7 @@
@echo off
 :optloop
 if "%1" == "-f" shift
-if "%1" == "-r" (set recursive=1 & goto :optloop)
+if "%1" == "-r" (shift & set recursive=1 & goto :optloop)
 if "%recursive%" == "1" goto :recursive
 :begin
 if "%1" == "" goto :end