set bootargs (typo wanted $fstype, not fstype)

Reference: /n/atom/patch/applied2013/amd64instdisk
Date: Fri Dec 27 09:55:18 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/lib/dist/amd64/install/main	Fri Dec 27 09:55:05 2013
+++ /sys/lib/dist/amd64/install/main	Fri Dec 27 09:55:05 2013
@@ -134,7 +134,7 @@
 	pick 'filesys to install' fses $fses(1); fstype=$cmd
 	eval 'fsparts=$' ^ fsparts$fstype
 
-	switch(fstype){
+	switch($fstype){
 	case kfs
 		d=`{echo $disk | sed 's!/dev/sd!!g'}
 		bootargs='local!#S/' ^ $d ^ '/fs -B 10000'