Fix spin time (#27)

* Update app.c

* Update app.c

Author: pablogs9

apps/int32_publisher/app.c

@@ -67,7 +67,7 @@ void appMain(void * arg)
 	msg.data = 0;
 
 	while(1){
-		rclc_executor_spin_some(&executor, 100);
+		rclc_executor_spin_some(&executor, RCL_MS_TO_NS(100));
 		usleep(100000);
 	}
 

apps/int32_subscriber/app.c

@@ -47,7 +47,7 @@ void appMain(void * arg)
 	RCCHECK(rclc_executor_add_subscription(&executor, &subscriber, &msg, &subscription_callback, ON_NEW_DATA));
 
         while(1){
-                rclc_executor_spin_some(&executor, 100);
+                rclc_executor_spin_some(&executor, RCL_MS_TO_NS(100));
                 usleep(100000);
         }