pack_refs(): remove redundant check

handle_one_ref() only adds refs to the cbdata.ref_to_prune list if
(cbdata.flags & PACK_REFS_PRUNE) is set.  So any references in this
list at the end of pack_refs() can be pruned unconditionally.
Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

pack-refs.c

@@ -143,7 +143,6 @@ int pack_refs(unsigned int flags)
 	packed.fd = -1;
 	if (commit_lock_file(&packed) < 0)
 		die_errno("unable to overwrite old ref-pack file");
-	if (cbdata.flags & PACK_REFS_PRUNE)
-		prune_refs(cbdata.ref_to_prune);
+	prune_refs(cbdata.ref_to_prune);
 	return 0;
 }