Read amd_master using print -rn, fixes problems if the file has multiple

lines. Problem noticed by me, this solution from halex@.
ok halex aja

src/etc/rc.d/amd

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $OpenBSD: amd,v 1.3 2011/07/16 09:33:29 sthen Exp $
+# $OpenBSD: amd,v 1.4 2011/08/22 08:02:04 nicm Exp $
 
 daemon="/usr/sbin/amd"
 
@@ -12,7 +12,7 @@ rc_stop=NO
 
 rc_pre() {
 	[ -e ${amd_master} ] || return 1
-	daemon_flags=$(cat ${amd_master})
+	daemon_flags=$(print -rn -- $(< ${amd_master}))
 }
 
 rc_start() {