fetch_refs_via_pack() discards status?

[Junio C Hamano <gitster@pobox.com>]

The code calls fetch_pack() to get the list of refs it fetched, and
discards refs and always returns 0 to signal success.

But builtin-fetch-pack.c::fetch_pack() has error cases.  The function
returns NULL if error is detected (shallow-support side seems to choose
to die but I suspect that is easily fixable to error out as well).

Shouldn't fetch_refs_via_pack() propagate that error to the caller?

---
 transport.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/transport.c b/transport.c
index 50db980..048df1f 100644
--- a/transport.c
+++ b/transport.c
@@ -655,7 +655,7 @@ static int fetch_refs_via_pack(struct transport *transport,
 	free(heads);
 	free_refs(refs);
 	free(dest);
-	return 0;
+	return (refs ? 0 : -1);
 }
 
 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)