drm/nouveau/devinit: Convert function disable() to be void

The current design of callback function disable() of struct
nvkm_devinit_func is defined to return a u64 value. In its implementation
in the driver modules, the function always returns a fixed value 0. Hence
the design and implementation of this function should be enhanced to return
void instead of a fixed value. This change also eliminates untouched
return variables.

The change is identified using the returnvar.cocci Coccinelle semantic
patch script.

Signed-off-by: Deepak R Varma <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Signed-off-by: Lyude Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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