unpack-trees: allow Porcelain to give different error messages

diff --git a/path.c b/path.c
index 2ae7cd997555883ecbe73b12fb53c1e6c650b62c..b7c24a2aacf87ffea6bd6380dbff44e5d317b240 100644 (file)
--- a/path.c
+++ b/path.c
@@ -91,7 +91,8 @@ int validate_headref(const char *path)
        struct stat st;
        char *buf, buffer[256];
        unsigned char sha1[20];
-       int len, fd;
+       int fd;
+       ssize_t len;
 
        if (lstat(path, &st) < 0)
                return -1;