Fix --radio-step in interactive mode

reco.c

@@ -320,14 +320,16 @@ input_thread (LaminoData *data)
     UfoBuffer *buffer;
     UfoRequisition req;
     guint current;
+    guint num_radios;
 
     current = 0;
     req.n_dims = 2;
     req.dims[0] = data->params->width;
     req.dims[1] = data->params->height;
     buffer = ufo_buffer_new (&req, NULL);
+    num_radios = data->params->num_radios / data->params->radio_step;
 
-    while (current < data->params->num_radios) {
+    while (current < num_radios) {
         gfloat *mem;
         gsize size;