5218 posix definition of NULL
correct unistd.h and iso/stddef_iso.h
update gate source affected

@@ -126,11 +126,11 @@
             sizeof (tnf_bufsize)) != sizeof (tnf_bufsize)) {
                 (void) fprintf(stderr, gettext(
                         "kvm_read error in %s\n"), dumpfile);
                 exit(1);
         }
-        if (dump_bufaddr == NULL || tnf_bufsize == 0) {
+        if (dump_bufaddr == (uintptr_t)NULL || tnf_bufsize == 0) {
                 (void) fprintf(stderr, gettext(
                         "No trace data available in the kernel.\n"));
                 exit(1);
         }
 }