MINOR: buffer: remove bi_ptr()
It's now been replaced by b_head() when b->o is null, ci_head() when
the channel is known, or b_peek(b, b->o) in other situations.
diff --git a/src/cache.c b/src/cache.c
index c1e6bcc..1265df3 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -224,7 +224,7 @@
c_adv(msg->chn, st->hdrs_len);
ret = shctx_row_data_append(shctx,
st->first_block,
- (unsigned char *)bi_ptr(msg->chn->buf),
+ (unsigned char *)ci_head(msg->chn),
MIN(ci_contig_data(msg->chn), len - st->hdrs_len));
/* Rewind the buffer to forward all data */
c_rew(msg->chn, st->hdrs_len);