From 97751ff9d594a62238ed9450085df6e34fb4692e Mon Sep 17 00:00:00 2001
From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Wed, 10 Dec 2008 11:54:08 -0800
Subject: [PATCH] Fix bad cast

---
 zfs/lib/libumem/getpcstack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/zfs/lib/libumem/getpcstack.c b/zfs/lib/libumem/getpcstack.c
index 8c3a47e19f..cc5e81a689 100644
--- a/zfs/lib/libumem/getpcstack.c
+++ b/zfs/lib/libumem/getpcstack.c
@@ -148,7 +148,7 @@ getpcstack(uintptr_t *pcstack, int pcstack_limit, int check_signal)
 			break;
 		else if (nextfp <= minfp || (tmp - base) >= size) {
 #ifndef UMEM_STANDALONE
-			if (tmp == NULL || !on_altstack)
+			if (tmp == 0 || !on_altstack)
 				break;
 			/*
 			 * If we're on an alternate signal stack, try jumping