[PATCH] utf8.c: fix strbuf_utf8_replace copying the last NUL to dst string

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

When utf8_width(&src) is called with *src == NULL (because the
source string ends with an ansi sequence), it returns 0 and steps
'src' by one. This stepping makes strbuf_utf8_replace add NUL to the
destination string at the end of the loop. Check and break the loop
early.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 utf8.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/utf8.c b/utf8.c
index b30790d..cd090a1 100644
--- a/utf8.c
+++ b/utf8.c
@@ -381,6 +381,8 @@ void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
 			src += n;
 			dst += n;
 		}
+		if (src >= end)
+			break;
 
 		old = src;
 		n = utf8_width((const char**)&src, NULL);
-- 
2.1.0.rc0.66.gb9187ad