fsck: Fix object count output

The object count comes from g_hash_table_size(), so it's not a 0 based
index. In order to maintain the mod calculations correctly, just print
out index + 1.

https://bugzilla.gnome.org/show_bug.cgi?id=746360

src/ostree/ot-builtin-fsck.c

@@ -224,7 +224,7 @@ fsck_reachable_objects_from_commits (OstreeRepo            *repo,
         goto out;
 
       if (mod == 0 || (i % mod == 0))
-        g_print ("%u/%u objects\n", i, count);
+        g_print ("%u/%u objects\n", i + 1, count);
       i++;
     }