silence compiler warning

diff --git a/lib/isc/crc64.c b/lib/isc/crc64.c
index cfabc9800d7a8a47444c6637940c34e4631404a2..5c158f317529d33e214fa1e5f19619c7a177d568 100644 (file)
--- a/lib/isc/crc64.c
+++ b/lib/isc/crc64.c
@@ -129,7 +129,7 @@ isc_crc64_update(isc_uint64_t *crc, const void *data, size_t len) {
        REQUIRE(crc != NULL);
        REQUIRE(data != NULL);
 
-       while (len-- > 0) {
+       while (len-- > 0U) {
                i = ((int) (*crc >> 56) ^ *p++) & 0xff;
                *crc = crc64_table[i] ^ (*crc << 8);
        }