Remove error on going up directory

Removed an error that would briefly appear on the screen if the user
were to attempt to change to the above directory whilst being in the
root directory.

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/playback.c

@@ -206,9 +206,7 @@ void playFile(void* infoIn)
 
 	while(stop == false)
 	{
-		gfxSwapBuffers();
-		gfxFlushBuffers();
-		gspWaitForVBlank();
+		svcSleepThread(100 * 1000);
 
 		/* When the last buffer has finished playing, break. */
 		if(lastbuf == true && waveBuf[0].status == NDSP_WBUF_DONE &&