[BUG] log response byte count, not request

Due to a shameless copy-paste typo, the number of bytes logged was
from the request and not the response. This bug has been present
for a long time.
diff --git a/src/log.c b/src/log.c
index de75aa2..8888aa8 100644
--- a/src/log.c
+++ b/src/log.c
@@ -367,7 +367,7 @@
 		 (s->logs.t_queue >= 0) ? s->logs.t_queue : -1,
 		 (s->logs.t_connect >= 0) ? s->logs.t_connect - s->logs.t_queue : -1,
 		 (tolog & LW_BYTES) ? "" : "+", s->logs.t_close,
-		 (tolog & LW_BYTES) ? "" : "+", s->logs.bytes_in,
+		 (tolog & LW_BYTES) ? "" : "+", s->logs.bytes_out,
 		 sess_term_cond[(s->flags & SN_ERR_MASK) >> SN_ERR_SHIFT],
 		 sess_fin_state[(s->flags & SN_FINST_MASK) >> SN_FINST_SHIFT],
 		 actconn, fe->feconn, be->beconn, s->srv ? s->srv->cur_sess : 0,