sizeof *data, when data isn't initalized, is that right?

I came across this code:

         struct mcp23s08_driver_data     *data;
	...
	data = kzalloc(sizeof *data + chips * sizeof(struct mcp23s08),
                         GFP_KERNEL);


Since data wasn't initialized when `sizeof *data' is called, wasn't this a non-initialized pointer dereference?

Cheers
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