Ensure no trailing input will screw things up

Reference: /n/sources/patch/applied/fshalt-drain
Date: Mon Nov 15 14:11:39 CET 2004

--- /rc/bin/fshalt	Mon Nov 15 14:11:38 2004
+++ /rc/bin/fshalt	Mon Nov 15 14:11:38 2004
@@ -11,6 +11,8 @@
 for(i in $f){
 	echo -n $i...
 	{
+		echo
+		dial/drain
 		echo fsys all sync
 		if(! dial/expect -t 120 ': ')
 			echo -n 'not synced...' > /dev/cons