Align --help

configure

@@ -121,7 +121,7 @@ ac_help="$ac_help
 ac_help="$ac_help
     --enable-null	  enable null backend [no]"
 ac_help="$ac_help
-    --with-null-module	module type [static]"
+    --with-null-module	  module type [static]"
 ac_help="$ac_help
     --enable-passwd	  enable passwd backend [no]"
 ac_help="$ac_help

configure.in

@@ -200,7 +200,7 @@ OL_ARG_ENABLE(monitor,[    --enable-monitor	  enable monitor backend], no)dnl
 OL_ARG_WITH(monitor_module,[    --with-monitor-module module type], static,
 	[static dynamic])
 OL_ARG_ENABLE(null,[    --enable-null	  enable null backend], no)dnl
-OL_ARG_WITH(null_module,[    --with-null-module	module type], static,
+OL_ARG_WITH(null_module,[    --with-null-module	  module type], static,
 	[static dynamic])
 OL_ARG_ENABLE(passwd,[    --enable-passwd	  enable passwd backend], no)dnl
 OL_ARG_WITH(passwd_module,[    --with-passwd-module  module type], static,