[PATCH 3/4] utf8: die if failed to re-encoding

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Return value NULL in this case means "no conversion needed", which is
not quite true when conv == -1.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 t/t4201-shortlog.sh |    2 +-
 utf8.c              |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/t4201-shortlog.sh b/t/t4201-shortlog.sh
index 6872ba1..d445665 100755
--- a/t/t4201-shortlog.sh
+++ b/t/t4201-shortlog.sh
@@ -27,7 +27,7 @@ test_expect_success 'setup' '
 		tr 1234 "\360\235\204\236")" a1 &&
 
 	# now fsck up the utf8
-	git config i18n.commitencoding non-utf-8 &&
+	git config i18n.commitencoding viscii &&
 	echo 4 >a1 &&
 	git commit --quiet -m "$(
 		echo "This is a very, very long first line for the commit message to see if it is wrapped correctly" |
diff --git a/utf8.c b/utf8.c
index def93ee..f918e9e 100644
--- a/utf8.c
+++ b/utf8.c
@@ -444,7 +444,7 @@ char *reencode_string(const char *in, const char *out_encoding, const char *in_e
 		return NULL;
 	conv = iconv_open(out_encoding, in_encoding);
 	if (conv == (iconv_t) -1)
-		return NULL;
+		die("failed to convert from %s to %s", in_encoding, out_encoding);
 	insz = strlen(in);
 	outsz = insz;
 	outalloc = outsz + 1; /* for terminating NUL */
-- 
1.7.8.36.g69ee2