fix case handling of shell script
diff --git a/configure.in b/configure.in
index 8596d93..fc77bf0 100644
--- a/configure.in
+++ b/configure.in
@@ -104,8 +104,8 @@ if $try_usb; then
 	fi
 fi
 case "$usb_msg" in
-	yes*) AC_DEFINE(HAVE_USB,1,[Whether you have USB support enabled])
-	*     ;;
+	yes*) AC_DEFINE(HAVE_USB,1,[Whether you have USB support enabled]) ;;
+	*)    ;;
 esac
 dnl AM_CONDITIONAL(ENABLEUSB, test "x$try_usb" = "true")