t3700-add: do not check working tree file mode without POSIXPERM

diff --git a/diff-no-index.c b/diff-no-index.c
index 03daadb25af835a695c7d0baf466b0e1f82b58c4..1f8999b9cabf52c85b63f27178023ff53b7567c3 100644 (file)
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -65,8 +65,7 @@ static int populate_from_stdin(struct diff_filespec *s)
        size_t size = 0;
 
        if (strbuf_read(&buf, 0, 0) < 0)
-               return error("error while reading from stdin %s",
-                                    strerror(errno));
+               return error_errno("error while reading from stdin");
 
        s->should_munmap = 0;
        s->data = strbuf_detach(&buf, &size);