[patch] ACPI, APEI, EINJ, cleanup 0 vs NULL confusion

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

This function is returning pointers.  Sparse complains here:
drivers/acpi/apei/einj.c:262:32: warning:
	Using plain integer as NULL pointer

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index bb20b03..c89b0e5 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -259,15 +259,15 @@ static void *einj_get_parameter_address(void)
 
 		v4param = ioremap(paddrv4, sizeof(*v4param));
 		if (!v4param)
-			return 0;
+			return NULL;
 		if (readq(&v4param->reserved1) || readq(&v4param->reserved2)) {
 			iounmap(v4param);
-			return 0;
+			return NULL;
 		}
 		return v4param;
 	}
 
-	return 0;
+	return NULL;
 }
 
 /* do sanity check to trigger table */
--
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