[PATCH] checkout: error out when index is unmerged even with -m

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

Even when -m is given to allow fallilng back to 3-way merge
while switching branches, we should refuse if the original index
is unmerged.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * I think this bug was inherited from the scripted version.
   Fixing it is much easier here.

 builtin-checkout.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/builtin-checkout.c b/builtin-checkout.c
index 283831e..e028270 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -226,8 +226,8 @@ static int merge_working_tree(struct checkout_opts *opts,
 		refresh_cache(REFRESH_QUIET);
 
 		if (unmerged_cache()) {
-			ret = opts->merge ? -1 :
-				error("you need to resolve your current index first");
+			error("you need to resolve your current index first");
+			return 1;
 		} else {
 			topts.update = 1;
 			topts.merge = 1;