Reintroduced grpc_byte_buffer_reader_destroy.

As a no-op for the time being.
diff --git a/include/grpc/grpc.h b/include/grpc/grpc.h
index f0fa85a..57bf2fa 100644
--- a/include/grpc/grpc.h
+++ b/include/grpc/grpc.h
@@ -93,7 +93,7 @@
 } grpc_arg;
 
 /** An array of arguments that can be passed around.
-    
+
     Used to set optional channel-level configuration.
     These configuration options are modelled as key-value pairs as defined
     by grpc_arg; keys are strings to allow easy backwards-compatible extension
@@ -174,6 +174,9 @@
 void grpc_byte_buffer_reader_init(grpc_byte_buffer_reader *reader,
                                   grpc_byte_buffer *buffer);
 
+/** Cleanup and destroy \a reader */
+void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader);
+
 /* At the end of the stream, returns 0. Otherwise, returns 1 and sets slice to
    be the returned slice. Caller is responsible for calling gpr_slice_unref on
    the result. */