audit: Use kzalloc() instead of kmalloc()/memset() in audit_krule_to_data()

Replace kmalloc+memset by kzalloc for better readability and simplicity.

This addresses the warning below:
WARNING: kzalloc should be used for data, instead of kmalloc/memset

Signed-off-by: Gongwei Li <ligongwei@kylinos.cn>
[PM: subject and description tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>

Author: ligongwei-qm

kernel/auditfilter.c

@@ -638,10 +638,9 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
 	void *bufp;
 	int i;
 
-	data = kmalloc(struct_size(data, buf, krule->buflen), GFP_KERNEL);
+	data = kzalloc(struct_size(data, buf, krule->buflen), GFP_KERNEL);
 	if (unlikely(!data))
 		return NULL;
-	memset(data, 0, sizeof(*data));
 
 	data->flags = krule->flags | krule->listnr;
 	data->action = krule->action;