diffcore-rename.c: avoid set-but-not-used warning

diff --git a/pack-check.c b/pack-check.c
index c3bf21dbcb4b79fdc815ef80ae5c970aafd02bbf..a1a521648deee8e7e82c4e2cb7fe8fe03605dc06 100644 (file)
--- a/pack-check.c
+++ b/pack-check.c
@@ -23,7 +23,7 @@ int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
                   off_t offset, off_t len, unsigned int nr)
 {
        const uint32_t *index_crc;
-       uint32_t data_crc = crc32(0, Z_NULL, 0);
+       uint32_t data_crc = crc32(0, NULL, 0);
 
        do {
                unsigned int avail;