drm/i915/guc: Verify result from CTB (de)register action

In commit b839a869dfc9 ("drm/i915/guc: Add support for data
reporting in GuC responses") we missed the hypothetical case
that GuC might return positive non-zero value as success data.

While that would be lucky treated as error case, and at the
end will result in reporting valid -EIO, in the meantime this
value will be passed to ERR_PTR that could be misleading.

v2: rebased

Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Michal Wajdeczko <[email protected]>
Cc: Dan Carpenter <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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