[PATCH 20/68] 0 -> NULL, for arch/xtensa

[Yoann Padioleau <padator@wanadoo.fr>]

When comparing a pointer, it's clearer to compare it to NULL than to 0.

Here is an excerpt of the semantic patch: 

@@
expression *E;
@@

  E ==
- 0
+ NULL

@@
expression *E;
@@

  E !=
- 0
+ NULL

Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: chris@zankel.net
Cc: akpm@linux-foundation.org
---

 kernel/pci.c           |    2 +-
 kernel/traps.c         |    2 +-
 platform-iss/console.c |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
index 77deae5..1102816 100644
--- a/arch/xtensa/kernel/pci.c
+++ b/arch/xtensa/kernel/pci.c
@@ -306,7 +306,7 @@ __pci_mmap_make_offset(struct pci_dev *d
 	unsigned long io_offset = 0;
 	int i, res_bit;
 
-	if (pci_ctrl == 0)
+	if (pci_ctrl == NULL)
 		return -EINVAL;		/* should never happen */
 
 	/* If memory, add on the PCI bridge address offset */
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index c5e62f9..eb21c7c 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -419,7 +419,7 @@ void show_stack(struct task_struct *task
 	int i = 0;
 	unsigned long *stack;
 
-	if (sp == 0)
+	if (sp == NULL)
 		__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
 
  	stack = sp;
diff --git a/arch/xtensa/platform-iss/console.c b/arch/xtensa/platform-iss/console.c
index 2f4f20f..ad8d65e 100644
--- a/arch/xtensa/platform-iss/console.c
+++ b/arch/xtensa/platform-iss/console.c
@@ -265,7 +265,7 @@ static void iss_console_write(struct con
 {
 	int len = strlen(s);
 
-	if (s != 0 && *s != 0)
+	if (s != NULL && *s != 0)
 		__simc (SYS_write, 1, (unsigned long)s,
 			count < len ? count : len,0,0);
 }

-
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