serial: update b_stream usage

serial/serial.h

@@ -2,19 +2,19 @@
 #define _SERIAL_SERIAL_H_
 
 #include <blue/core/object.h>
+#include <blue/core/stream.h>
 #include <blue/serial.h>
 #include <stdint.h>
 
 struct b_serial_ctx {
-	struct b_stream_pipeline *ctx_pipeline;
+	b_stream_buffer *ctx_streambuf;
 };
 
 struct b_serial_format_ops {
 	enum b_status (*fmt_serialise)(
-		struct b_serial_ctx *, b_object *, struct b_stream *,
-		enum b_serial_flags);
+		struct b_serial_ctx *, b_object *, b_stream *, enum b_serial_flags);
 	enum b_status (*fmt_deserialise)(
-		struct b_serial_ctx *, struct b_stream *, b_object **,
+		struct b_serial_ctx *, b_stream *, b_object **,
 		enum b_serial_flags);
 };