[PATCH 3/4] rerere: try_merge() should use LL_MERGE_ERROR when it means an error

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

When the preimage or the postimage files cannot be read, the
try_merge() helper function returns LL_MERGE_CONFLICT.  To all of
its callers, this does not make them do wrong things per-se, as they
are only checking if the result is 0 and LL_MERGE_CONFLICT is not 0.

But it is an error if we fail to read the input we expect to be able
to read; return LL_MERGE_ERROR instead.  This does not change any
behaviour---it just makes the code use the "correct" constant to
signal an error.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 rerere.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rerere.c b/rerere.c
index 4ce1270a94..6bc3c54d3b 100644
--- a/rerere.c
+++ b/rerere.c
@@ -617,7 +617,7 @@ static int try_merge(struct index_state *istate,
 
 	if (read_mmfile(&base, rerere_path(id, "preimage")) ||
 	    read_mmfile(&other, rerere_path(id, "postimage"))) {
-		ret = LL_MERGE_CONFLICT;
+		ret = LL_MERGE_ERROR;
 	} else {
 		/*
 		 * A three-way merge. Note that this honors user-customizable
-- 
2.42.0-29-gcd9da15a85