Merge branch 'np/pack'

* np/pack:
  t5300: improve SHA1 collision test
  pack-objects: don't include missing preferred base objects
  sha1write: don't copy full sized buffers

Conflicts:
	t/t5300-pack-object.sh

builtin-pack-objects.c

@@ -1725,6 +1725,14 @@ static void prepare_pack(int window, int depth)
 			if (entry->type < 0)
 				die("unable to get type of object %s",
 				    sha1_to_hex(entry->idx.sha1));
+		} else {
+			if (entry->type < 0) {
+				/*
+				 * This object is not found, but we
+				 * don't have to include it anyway.
+				 */
+				continue;
+			}
 		}
 
 		delta_list[n++] = entry;