Fix off-by-one buffer overflow in add_index_color

diff --git a/hdrline.c b/hdrline.c
index cfc2c2ebb7f7a3b22022bf572ebf24f55f75362d..8f8ffc2a5edfacfcce3867c35f706c2d41efadb7 100644 (file)
--- a/hdrline.c
+++ b/hdrline.c
@@ -173,7 +173,7 @@ static size_t add_index_color(char *buf, size_t buflen, enum FormatFlag flags, c
     buflen -= len;
   }
 
-  if (buflen < 2)
+  if (buflen <= 2)
     return 0;
 
   buf[0] = MUTT_SPECIAL_INDEX;