addloop sets up an aoe device not a loopback device

Reference: /n/atom/patch/applied2013/addloopfix
Date: Fri May 24 23:05:38 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /rc/bin/addloop	Fri May 24 23:05:38 2013
+++ /rc/bin/addloop	Fri May 24 23:05:38 2013
@@ -1,7 +1,7 @@
 #!/bin/rc
 # addloop c path - add an loopback device as sd$c
-if (! ~ $#* 2 || ! ~ $1 ? || ! ~ $2 *.*) {
+if (! ~ $#* 2 || ! ~ $1 ?){
 	echo usage: $0 letter path >[1=2]
 	exit usage
 }
-echo config switch on spec $1 type aoe/$2 >/dev/sdctl
+echo config switch on spec $1 type loop/$2 >/dev/sdctl