fix bugs

Author: anyshu

tools/server/server-diffusion.cpp

@@ -4063,7 +4063,6 @@ struct server_context {
                             (int32_t)prompt_text_tokens.size(), 
                             &slot, 
                             this, 
-                            "", 
                             last_tokens_buffer.data() 
                         };
                         diff_params.step_callback = diffusion_step_callback;
@@ -5641,7 +5640,7 @@ int main(int argc, char ** argv) {
             files);
 
         // Check if this is a diffusion request by looking for diffusion-specific parameters
-        bool is_diffusion = llama_model_is_diffusion(ctx_server.model)
+        bool is_diffusion = llama_model_is_diffusion(ctx_server.model);
 
         server_task_type task_type = is_diffusion ? SERVER_TASK_TYPE_DIFFUSION : SERVER_TASK_TYPE_COMPLETION;