Smack: fix for /smack/access output, use string instead of byte

Small fix for the output of access SmackFS file. Use string
is instead of byte. Makes it easier to extend API if it is
needed.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>

security/smack/smackfs.c

@@ -1497,6 +1497,7 @@ static ssize_t smk_write_access(struct file *file, const char __user *buf,
 {
 	struct smack_rule rule;
 	char *data;
+	int res;
 
 	if (!capable(CAP_MAC_ADMIN))
 		return -EPERM;
@@ -1508,8 +1509,10 @@ static ssize_t smk_write_access(struct file *file, const char __user *buf,
 	if (count < SMK_LOADLEN || smk_parse_rule(data, &rule))
 		return -EINVAL;
 
-	data[0] = smk_access(rule.smk_subject, rule.smk_object,
-			     rule.smk_access, NULL) == 0;
+	res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
+			  NULL);
+	data[0] = res == 0 ? '1' : '0';
+	data[1] = '\0';
 
 	simple_transaction_set(file, 1);
 	return SMK_LOADLEN;