rsx: Remove superfluous log

- Back-to-back range with no barrier will already be logged in draw_call::append

Author: kd-11

rpcs3/Emu/RSX/NV47/FW/draw_call.cpp

@@ -101,8 +101,6 @@ namespace rsx
 
 		if (draw_command_barriers.empty())
 		{
-			// Raise alarm here for investigation, we may be missing a corner case.
-			rsx_log.error("Instanced draw detected, but no command barriers found!");
 			return false;
 		}