Fix typo in HAVE_DBUS automake conditional

The variable that is set in the script is with_dbus, not have_dbus.

AUTHORS

@@ -267,6 +267,7 @@ Patches have also been contributed by:
   Dwight Engen         <dwight.engen@oracle.com>
   liguang              <lig.fnst@cn.fujitsu.com>
   Chuck Short          <zulcss@gmail.com>
+  Alexander Larsson    <alexl@redhat.com>
 
   [....send patches to get your name here....]
 

configure.ac

@@ -1251,7 +1251,7 @@ if test "$with_dbus" = "yes" ; then
   LIBS="$save_LIBS"
   CFLAGS="$save_CFLAGS"
 fi
-AM_CONDITIONAL([HAVE_DBUS], [test "$have_dbus" = "yes"])
+AM_CONDITIONAL([HAVE_DBUS], [test "$with_dbus" = "yes"])
 
 
 dnl PolicyKit library