GBytes: Add copy-func and free-func annotations

glib/gbytes.c

@@ -37,7 +37,7 @@
 #include <string.h>
 
 /**
- * GBytes:
+ * GBytes: (copy-func g_bytes_ref) (free-func g_bytes_unref)
  *
  * A simple refcounted data type representing an immutable sequence of zero or
  * more bytes from an unspecified origin.
@@ -609,4 +609,4 @@ g_bytes_get_region (GBytes *bytes,
    */
 
   return ((guchar *) bytes->data) + offset;
-}
+}