MINOR: stream: Export stream_free()

The stream_free() function is now public. It is mandatory to properly handle
errors when a new applet is started.
diff --git a/include/haproxy/stream.h b/include/haproxy/stream.h
index 5660857..a469e4b 100644
--- a/include/haproxy/stream.h
+++ b/include/haproxy/stream.h
@@ -60,6 +60,7 @@
 extern struct data_cb sess_conn_cb;
 
 struct stream *stream_new(struct session *sess, struct conn_stream *cs, struct buffer *input);
+void stream_free(struct stream *s);
 int stream_upgrade_from_cs(struct conn_stream *cs, struct buffer *input);
 int stream_set_http_mode(struct stream *s, const struct mux_proto_list *mux_proto);
 
diff --git a/src/stream.c b/src/stream.c
index 00abce6..dd3358e 100644
--- a/src/stream.c
+++ b/src/stream.c
@@ -580,7 +580,7 @@
 /*
  * frees  the context associated to a stream. It must have been removed first.
  */
-static void stream_free(struct stream *s)
+void stream_free(struct stream *s)
 {
 	struct session *sess = strm_sess(s);
 	struct proxy *fe = sess->fe;