alfred: clean up delay code

package/gluon-alfred/files/lib/gluon/alfred/announce.sh

@@ -15,7 +15,7 @@ fi
 # set defaults
 [ -z "$ALFRED_DATA_TYPE" ] && ALFRED_DATA_TYPE=158
 [ -z "$NET_IF" ] && NET_IF=br-client
-[ -z "$MAX_WAIT" ] && MAX_WAIT=300
+[ -z "$MAX_WAIT" ] && MAX_WAIT=299
 
 set -e
 
@@ -23,7 +23,7 @@ set -e
 # simultaneously, wait for a random time between 0 and 300 seconds, but fixed
 # for each device to maintain 5 minutes between updates.
 # Calculated using first 3 hex digits of the primary MAC address' MD5 hash
-DELAY=$((0x$(sysconfig primary_mac | tr -d ':' | md5sum | head -c3) * $MAX_WAIT / (16**3)))
+DELAY=$((0x$(sysconfig primary_mac | md5sum | head -c3) * $MAX_WAIT / (16**3)))
 sleep $DELAY
 
 json_init