fghSleepForEvents immediately returns if we have an idle callback, so simply don't call the function at all if we just processed the idle callback

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1553 7f0cb862-5218-0410-a997-914c9d46530a

freeglut/freeglut/src/fg_main.c

@@ -374,7 +374,7 @@ static void fghSleepForEvents( void )
 {
     fg_time_t msec;
 
-    if( fgState.IdleCallback || fghHavePendingRedisplays( ) )
+    if( fghHavePendingRedisplays( ) )
         return;
 
     msec = fghNextTimer( );
@@ -447,8 +447,8 @@ void FGAPIENTRY glutMainLoop( void )
                     fgSetWindow( window );
                 fgState.IdleCallback( );
             }
-
-            fghSleepForEvents( );
+            else
+                fghSleepForEvents( );
         }
     }