t4200: skip gc-rerere test on systems with non GNU date.

diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index de44adabf09dcb47090e7865d6cd77677115d2b6..286919e71428049eda1449ba71ac81667ebc3f7d 100644 (file)
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -14,6 +14,8 @@ static unsigned int contains(struct diff_filespec *one,
        const char *data;
        if (diff_populate_filespec(one, 0))
                return 0;
+       if (!len)
+               return 0;
 
        sz = one->size;
        data = one->data;