Index: stable/10/lib/libz/inflate.c
===================================================================
--- stable/10/lib/libz/inflate.c
+++ stable/10/lib/libz/inflate.c
@@ -1504,7 +1504,7 @@
 {
     struct inflate_state FAR *state;
 
-    if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
+    if (strm == Z_NULL || strm->state == Z_NULL) return -(1L << 16);
     state = (struct inflate_state FAR *)strm->state;
     return ((long)(state->back) << 16) +
         (state->mode == COPY ? state->length :
Index: stable/9/lib/libz/inflate.c
===================================================================
--- stable/9/lib/libz/inflate.c
+++ stable/9/lib/libz/inflate.c
@@ -1504,7 +1504,7 @@
 {
     struct inflate_state FAR *state;
 
-    if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
+    if (strm == Z_NULL || strm->state == Z_NULL) return -(1L << 16);
     state = (struct inflate_state FAR *)strm->state;
     return ((long)(state->back) << 16) +
         (state->mode == COPY ? state->length :