nouveau: Use gl_array_attribute::_ElementSize.

Instead of open coding the size computation, use the
already available gl_array_attribute::_ElementSize value.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>

src/mesa/drivers/dri/nouveau/nouveau_vbo_t.c

@@ -49,7 +49,7 @@ get_array_stride(struct gl_context *ctx, const struct tnl_vertex_array *a)
 	if (render->mode == VBO && !_mesa_is_bufferobj(binding->BufferObj)) {
 		const struct gl_array_attributes *attrib = a->VertexAttrib;
 		/* Pack client buffers. */
-		return align(_mesa_sizeof_type(attrib->Type) * attrib->Size, 4);
+		return align(attrib->_ElementSize, 4);
 	} else {
 		return binding->Stride;
 	}