fix minor unreachable code caused by t.Fatal

Signed-off-by: Abirdcfly <fp544037857@gmail.com>

reloader/reloader_test.go

@@ -42,8 +42,8 @@ func TestNoRead(t *testing.T) {
 	}
 	_, err := New(f.Name(), noop, testErrCb(t))
 	if err == nil {
-		t.Fatalf("Expected New to return error when permission denied.")
 		readFile = oldReadFile
+		t.Fatalf("Expected New to return error when permission denied.")
 	}
 	readFile = oldReadFile
 }