libmobile_zte: use str_remove_substr to sanitize query

libmobile_zte.c

@@ -518,11 +518,19 @@ fail:
 
 struct json_object *mobile_create_apn_profile_zte(char *ip_addr, struct profile_params_zte *params)
 {
-	char query[1024] = {0};
+	char query[1024] = {0}, *sanitized_query;
+	struct json_object *response;
 
 	snprintf(query, 1023, "isTest=false&goformId=APN_PROC_EX&apn_action=save&apn_mode=manual&profile_name=%s&wan_dial=*99%%23&apn_select=manual&pdp_type=%s&pdp_select=auto&pdp_addr=&index=%d&wan_apn=%s&ppp_auth_mode=%s&ppp_username=%s&ppp_passwd=%s&dns_mode=%s&prefer_dns_manual=%s&standby_dns_manual=%s", params->name, params->pdp_type, get_apn_profiles_len(ip_addr), params->wan_apn, params->authentication, params->username, params->password, params->dns_mode, params->dns1, params->dns2);
+	sanitized_query = str_remove_substr(query, "(null)");
+	if (!sanitized_query)
+		goto fail;
 
-	return perform_request(ip_addr, query, POST);
+	response = perform_request(ip_addr, sanitized_query, POST);
+
+	free(sanitized_query);
+fail:
+	return response;
 }
 
 struct json_object *mobile_set_apn_profile_zte(char *ip_addr, char *name)