Use a uniform approach for the largest value of an unsigned type.

1 files changed, 1 insertions, 1 deletions

diff --git a/inflate.c b/inflate.c
index 0372edf..92e9139 100644
--- a/inflate.c
+++ b/inflate.c
@@ -1555,7 +1555,7 @@ unsigned long ZEXPORT inflateCodesUsed(strm)
 z_streamp strm;
 {
     struct inflate_state FAR *state;
-    if (inflateStateCheck(strm)) return (unsigned long)0 - 1;
+    if (inflateStateCheck(strm)) return (unsigned long)-1;
     state = (struct inflate_state FAR *)strm->state;
     return (unsigned long)(state->next - state->codes);
 }