don't reset $patch; this messes up patch application.

Reference: /n/atom/patch/applied2013/apatchupd
Date: Wed Jun  5 15:09:28 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /rc/bin/apatch/Apply	Wed Jun  5 15:08:37 2013
+++ /rc/bin/apatch/Apply	Wed Jun  5 15:08:37 2013
@@ -12,7 +12,6 @@
 
 errs=/tmp/apply.$pid
 if($patch/apply $* |[2] tee $errs){
-	patch=$1
 	if(test -d $PD/$patch.*){
 		echo '#you could:'
 		echo rm -rf $PD/$patch.*