vk/wsi: avoid reading uninitialised memory

It will be ignored by x11_swapchain_result() anyway (because reaching
the `fail` label without setting `result` means the swapchain status was
already a hard error), but the compiler still complains about reading
uninitialised memory.

While at it, drop the unused assignment right before returning.

Signed-off-by: Eric Engestrom <[email protected]>
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>

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