[PATCH v3 3/3] refs/files-backend: correct return value in lock_ref_for_update

["Martin Ågren" <martin.agren@gmail.com>]

In one code path we return a literal -1 and not a symbolic constant. The
value -1 would be interpreted as TRANSACTION_NAME_CONFLICT, which is
wrong. Use TRANSACTION_GENERIC_ERROR instead (that is the only other
return value we have to choose from).

Noticed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
v3: this is a new patch, as suggested by Michael

 refs/files-backend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index a2b3df21b..ad05d1d5f 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2311,7 +2311,7 @@ static int lock_ref_for_update(struct files_ref_store *refs,
 					strbuf_addf(err, "cannot lock ref '%s': "
 						    "error reading reference",
 						    original_update_refname(update));
-					ret = -1;
+					ret = TRANSACTION_GENERIC_ERROR;
 					goto out;
 				}
 			} else if (check_old_oid(update, &lock->old_oid, err)) {
-- 
2.14.1.151.g45c1275a3.dirty