stop ignoring Wmissing-field-initializers and fix (#9912)

src/examples/uuv_example_app/uuv_example_app.cpp

@@ -88,10 +88,11 @@ int uuv_example_app_main(int argc, char *argv[])
 	orb_advert_t act_pub = orb_advertise(ORB_ID(actuator_controls_0), &act);
 
 	/* one could wait for multiple topics with this technique, just using one here */
-	px4_pollfd_struct_t fds[] = {
-		{ .fd = sensor_sub_fd,   .events = POLLIN },
-		{ .fd = vehicle_attitude_sub_fd,   .events = POLLIN },
-	};
+	px4_pollfd_struct_t fds[2] = {};
+	fds[0].fd = sensor_sub_fd;
+	fds[0].events = POLLIN;
+	fds[1].fd = vehicle_attitude_sub_fd;
+	fds[1].events = POLLIN;
 
 	int error_counter = 0;