[tip:x86/cleanups] x86/iommu: Use NULL instead of 0

[tip-bot for Zhong Jiang <tipbot@zytor.com>]

Commit-ID:  0b2c1aec49ddb2260894df6c69ae7b34142ff936
Gitweb:     https://git.kernel.org/tip/0b2c1aec49ddb2260894df6c69ae7b34142ff936
Author:     Zhong Jiang <zhongjiang@huawei.com>
AuthorDate: Sat, 21 Jul 2018 16:33:24 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 2 Aug 2018 14:33:19 +0200

x86/iommu: Use NULL instead of 0

Fixes the following sparse warning:

arch/x86/kernel/pci-iommu_table.c:63:37: warning: Using plain integer as NULL pointer

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <hpa@zytor.com>
Cc: <gregkh@linuxfoundation.org>
Link: https://lkml.kernel.org/r/1532162004-24670-1-git-send-email-zhongjiang@huawei.com

---
 arch/x86/kernel/pci-iommu_table.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/pci-iommu_table.c b/arch/x86/kernel/pci-iommu_table.c
index 4dfd90a75e63..2e9006c1e240 100644
--- a/arch/x86/kernel/pci-iommu_table.c
+++ b/arch/x86/kernel/pci-iommu_table.c
@@ -60,7 +60,7 @@ void __init check_iommu_entries(struct iommu_table_entry *start,
 			printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n",
 			       p->detect, q->detect);
 			/* Heavy handed way..*/
-			x->depend = 0;
+			x->depend = NULL;
 		}
 	}