Fix memory leak on windows in diriter.

src/path.c

@@ -1231,6 +1231,8 @@ void git_path_diriter_free(git_path_diriter *diriter)
 	if (diriter == NULL)
 		return;
 
+	git_buf_free(&diriter->path_utf8);
+
 	if (diriter->handle != INVALID_HANDLE_VALUE) {
 		FindClose(diriter->handle);
 		diriter->handle = INVALID_HANDLE_VALUE;