forgot to add space in the case of usb=y.

Reference: /n/atom/patch/applied/ipleddusbnit
Date: Sat Jan  2 22:36:55 CET 2016
Signed-off-by: quanstro@quanstro.net

--- /sys/src/boot/pcipl/edd.c	Sat Jan  2 22:36:37 2016
+++ /sys/src/boot/pcipl/edd.c	Sat Jan  2 22:36:38 2016
@@ -83,7 +83,7 @@
 	else if(memcmp(p->iface, "SATA", 4) == 0)
 		n = 1;
 	else if(memcmp(p->iface, "USB", 3) == 0){
-		confappend("usb=y ", 5);
+		confappend("usb=y ", 6);
 		n = 8;
 	}
 	else