buf.c: fix off by one bug in buf_add_char()

Written-by: @Consolatis
Fixes: #2313

diff --git a/src/common/buf.c b/src/common/buf.c
index 70be9ed0d7d2b1c2fdbdd9d8521a739a8fd6a405..1e103fae22395eccb224b345b38a106553898c6f 100644 (file)
--- a/src/common/buf.c
+++ b/src/common/buf.c
@@ -144,7 +144,7 @@ buf_add(struct buf *s, const char *data)
 void
 buf_add_char(struct buf *s, char ch)
 {
-       buf_expand(s, s->len + 1);
+       buf_expand(s, s->len + 2);
        s->data[s->len++] = ch;
        s->data[s->len] = '\0';
 }