fix dereference nullptr & use uninitialized memory (#5)

* SColor: initialize color

* r5684 on ogl-es

include/SColor.h

@@ -444,7 +444,7 @@ namespace video
 		}
 
 		//! color in A8R8G8B8 Format
-		u32 color;
+		u32 color{};
 	};
 
 

include/SMaterialLayer.h

@@ -71,10 +71,13 @@ namespace video
 
 		//! Destructor
 		~SMaterialLayer()
+		{
+			if(TextureMatrix)
 			{
 				MatrixAllocator.destruct(TextureMatrix);
 				MatrixAllocator.deallocate(TextureMatrix);
 			}
+		}
 
 		//! Assignment operator
 		/** \param other Material layer to copy from.