autoconf: Small update to configure.ac

configure.ac

diff --git a/configure.ac b/configure.ac
index bfdcb34..9d5eddb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.68)
-AC_INIT(libusbmuxd, [m4_esyscmd(./git-version-gen $RELEASE_VERSION)], [https://github.com/libimobiledevice/libusbmuxd/issues],, [https://libimobiledevice.org])
+AC_INIT(libusbmuxd, [m4_esyscmd(./git-version-gen $RELEASE_VERSION)], [https://github.com/libimobiledevice/libusbmuxd/issues], [], [https://libimobiledevice.org])
 AM_INIT_AUTOMAKE([dist-bzip2 no-dist-gzip check-news])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
 AC_CONFIG_SRCDIR([src/])