Fix disk-image-create's getopt error handling:

We originally checked the return code of getopt, but subsequently
a debugging echo has been inserted and now we are checking the
return code of "echo", which is very rarely going to be useful.

Change-Id: I054fecaf6576d5e9d42b07159bba7d50335bf6cc

bin/disk-image-create

@@ -32,8 +32,8 @@ function show_options () {
 
 COMPRESS_IMAGE="true"
 TEMP=`getopt -o a:ho:xu -n $SCRIPTNAME -- "$@"`
-echo "XXX $TEMP"
 if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
+echo "XXX $TEMP"
 
 # Note the quotes around `$TEMP': they are essential!
 eval set -- "$TEMP"