Make usage message appear before root user check

This allows joe user to see the usage message without
having to specify -h. Trivial.

Signed-off-by: Simo Leone <simo@archlinux.org>

mkarchiso

@@ -47,17 +47,17 @@ while getopts 'i:P:p:a:fvh' arg; do
     esac
 done
 
+shift $(($OPTIND - 1))
+echo "ARGS: $@"
+
+[ $# -le 1 ] && usage 1
+
 # do UID checking here so someone can at least get usage instructions
 if [ "$EUID" != "0" ]; then
     echo "error: This script must be run as root."
     exit 1
 fi
 
-shift $(($OPTIND - 1))
-echo "ARGS: $@"
-
-[ $# -le 1 ] && usage 1
-
 command_name="${1}"
 case "${command_name}" in
     install) work_dir="${2}" ;;