worktree: prepare for more checks of whether path can become worktree

diff --git a/csum-file.h b/csum-file.h
index c5a2e335e7e063528da8386cc95fba4f7bb5bfe8..3bf7184736365c2034b6851ca4a1f3c9d052cb42 100644 (file)
--- a/csum-file.h
+++ b/csum-file.h
@@ -1,6 +1,8 @@
 #ifndef CSUM_FILE_H
 #define CSUM_FILE_H
 
+#include "hash.h"
+
 struct progress;
 
 /* A SHA1-protected file */