Eases checking of output array for GraphicsDevice.GetRenderTargetsNoA…

…llocEXT

src/Graphics/GraphicsDevice.cs

@@ -1052,7 +1052,7 @@ public int GetRenderTargetsNoAllocEXT(RenderTargetBinding[] output)
 			{
 				return renderTargetCount;
 			}
-			else if (output.Length != renderTargetCount)
+			else if (output.Length < renderTargetCount)
 			{
 				throw new ArgumentException("Output buffer size incorrect");
 			}