cmd_buffer->pool should never be NULL. Even if AllocateCommandBuffers()
fails, the successfully created cmdbuffers would have it set correctly.
From the Vulkan spec:
"VUID-vkFreeCommandBuffers-pCommandBuffers-parent
Each element of pCommandBuffers that is a valid handle must have
been created, allocated, or retrieved from commandPool."
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15164>
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