works as intended

fb/main.go

@@ -43,12 +43,13 @@ func Draw(img image.Image) error {
 		for w := 0; w < Width; w++ {
 			_, err := buf.Write(Bytes(img.At(w, h)))
 			if err != nil {
-				panic(err)
+				return err
 			}
 		}
 	}
 	err := buf.Flush()
 	if err != nil {
-		panic(err)
+		return err
 	}
+	return nil
 }