[Nouveau] Kernel patch: validate nouveau_channel_get id argument

[Michel Hermier]

Hi,
While hacking libdrm I triggered a kernel oups due to a non checked
argument from user land.
In nouveau_ioctl_notifier_alloc, nouveau_channel_get is invoked, but
it doesn't validate the na->channel input argument. The attached patch
validates the channel index, and change it's type to uint32_t since it
is an index after all.

Cheers,
    Michel
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