audit: fixup: log on errors from filter user rules

In commit 724e4fcc the intention was to pass any errors back from
audit_filter_user_rules() to audit_filter_user().  Add that code.
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

kernel/auditfilter.c

@@ -1339,8 +1339,8 @@ static int audit_filter_user_rules(struct audit_krule *rule, int type,
 			break;
 		}
 
-		if (!result)
-			return 0;
+		if (result <= 0)
+			return result;
 	}
 	switch (rule->action) {
 	case AUDIT_NEVER:    *state = AUDIT_DISABLED;	    break;