git-cvsserver: fix call to nonexistant cleanupWorkDir()

git-cvsserver.perl contained a single call to a nonexistant function
cleanupWorkDir(). This was obviously a typo for cleanupWorkTree().

Signed-off-by: Lars Noschinski <lars@public.noschinski.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-cvsserver.perl b/git-cvsserver.perl
index 920bbe1..b00d1c2 100755
--- a/git-cvsserver.perl
+++ b/git-cvsserver.perl
@@ -1884,7 +1884,7 @@
     }
 
     # done; get out of the tempdir
-    cleanupWorkDir();
+    cleanupWorkTree();
 
     print "ok\n";