refs.c: make sure log_ref_setup returns a meaningful errno

Making errno when returning from log_ref_setup() meaningful,

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Michael Haggerty <mhagger@alum.mit.edu>

1 files changed, 3 insertions, 1 deletions

diff --git a/refs.h b/refs.h
index 65f76376fe..82cc5cb2a1 100644
--- a/refs.h
+++ b/refs.h
@@ -158,7 +158,9 @@ extern void unlock_ref(struct ref_lock *lock);
 /** Writes sha1 into the ref specified by the lock. **/
 extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
 
-/** Setup reflog before using. **/
+/*
+ * Setup reflog before using. Set errno to something meaningful on failure.
+ */
 int log_ref_setup(const char *refname, char *logfile, int bufsize);
 
 /** Reads log for the value of ref during at_time. **/