Graphics/DeferredRenderQueue: Fix crash on layer removal

Former-commit-id: 87fdfb051158d241754eb6f1f811d12e88811a47 [formerly c5ae03d7168851330dd2c087c515c7d30ad863c7] [formerly 0f5debff94e6a37dde830975fd219daf82382d9d [formerly 42297b9b5af5b42e4c12146d930b6641425de8f4]]
Former-commit-id: b93ecd34f72724806ea06c6d335a41c7dd1afacb [formerly ad14d199f3ee381221df118b4af2cd647ab8fc24]
Former-commit-id: 805f20df11668bf73d35065e23c4912800850427

src/Nazara/Graphics/DeferredRenderQueue.cpp

@@ -273,7 +273,7 @@ namespace Nz
 			layers.clear();
 		else
 		{
-			for (auto it = layers.begin(); it != layers.end(); ++it)
+			for (auto it = layers.begin(); it != layers.end();)
 			{
 				Layer& layer = it->second;
 				if (layer.clearCount++ >= 100)
@@ -307,6 +307,8 @@ namespace Nz
 							pipelineEntry.maxInstanceCount = 0;
 						}
 					}
+
+					++it;
 				}
 			}
 		}