[PATCH] MSR: fix badzero.cocci warnings

[kbuild test robot]

arch/x86/kernel/msr_whitelist.c:200:18-19: WARNING comparing pointer to 0
arch/x86/kernel/msr_whitelist.c:203:27-28: WARNING comparing pointer to 0

 Compare pointer-typed values to NULL rather than 0

Semantic patch information:
 This makes an effort to choose between !x and x == NULL.  !x is used
 if it has previously been used with the function used to initialize x.
 This relies on type information.  More type information can be obtained
 using the option -all_includes and the option -I to specify an
 include path.

Generated by: scripts/coccinelle/null/badzero.cocci

CC: Marty McFadden <mcfadden8@xxxxxxxx>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---

 msr_whitelist.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/msr_whitelist.c
+++ b/arch/x86/kernel/msr_whitelist.c
@@ -197,10 +197,10 @@ static const struct file_operations fops
 
 static void delete_whitelist(void)
 {
-	if (whitelist == 0)
+	if (whitelist == NULL)
 		return;
 
-	if (whitelist->msrdata != 0)
+	if (whitelist->msrdata != NULL)
 		kfree(whitelist->msrdata);
 
 	kfree(whitelist);