BUG/MINOR: stream: Don't forget to remove CF_WAKE_ONCE flag on response channel

This flag can be set on a channel to pretend there is activity on it. This is a
way to wake-up the corresponding stream and evaluate stream analyzers on the
channel. It is correctly handled on both channels but removed only on the
request channel.

This patch is flagged as a bug but for now, CF_WAKE_ONCE is never set on the
response channel.
diff --git a/src/stream.c b/src/stream.c
index 4e34f38..1aa5475 100644
--- a/src/stream.c
+++ b/src/stream.c
@@ -1881,6 +1881,7 @@
 
 		rp_cons_last = si_f->state;
 		rp_prod_last = si_b->state;
+		res->flags &= ~CF_WAKE_ONCE;
 		rpf_last = res->flags;
 
 		if ((res->flags ^ flags) & CF_MASK_STATIC)