Some comment improving

src/iomux_epoll.c

@@ -170,7 +170,7 @@ again:
 
     event_cnt = iomux_timers_run(mux_); //process timers
 
-    if (rc == 0) //Just the timeout
+    if (rc == 0) //no fd's were ready, no more work to do
         return event_cnt;
 
     for (i = 0; i < rc; i++) {

src/iomux_select.c

@@ -157,7 +157,7 @@ again:
 
     event_cnt = iomux_timers_run(mux_); //fire the timers
 
-    if (rc == 0) //Just the timeout
+    if (rc == 0) //no fd's were ready, no more work to do
         return event_cnt;
     
     for (i = 0; rc >= 0 && i < mux->num_descriptors; i++) {