fix segfault in certain situations do to missing arguments

re enable mwindow size stuff due to divide by zero's happening on
larger repositories

XD.c

@@ -93,8 +93,6 @@ git_repository
 
   /* disable a bunch of git options to hopefully speed things up */
   git_libgit2_opts(GIT_OPT_ENABLE_CACHING, 0);
-  git_libgit2_opts(GIT_OPT_SET_MWINDOW_SIZE, 0);
-  git_libgit2_opts(GIT_OPT_SET_MWINDOW_MAPPED_LIMIT, 0);
 
   git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, "");
   git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_XDG, "");
@@ -191,8 +189,8 @@ has_staged(git_repository *repo)
   git_status_options opts = GIT_STATUS_OPTIONS_INIT;
   int i, c, r = 0;
 
-  opts.flags = GIT_STATUS_INDEX_NEW;
   opts.show = GIT_STATUS_SHOW_INDEX_ONLY;
+  opts.flags = GIT_STATUS_INDEX_NEW;
 
   if (git_status_list_new(&list, repo, &opts) < 0) {
     L("Error checking for staged changes: %s", git_error_last()->message);
@@ -224,7 +222,7 @@ main(int argc, char *argv[])
   int code = -1;
 
   /* print version information */
-  if (strcmp(argv[1], "-v") == 0) {
+  if (argc > 1 && strcmp(argv[1], "-v") == 0) {
     printf("XD [number] v%s\n", VERSION);
     return 0;
   }