drm/i915: Ditch the i915_gem_ww_ctx loop member

It's only used by the for_i915_gem_ww() macro and we can use
the (typically) on-stack _err variable in its place.

v2:
- Don't clear the _err variable when entering the loop
  (Matthew Auld, Maarten Lankhorst).
- Use parentheses around the _err macro argument.
- Fix up comment.

Cc: Matthew Auld <[email protected]>
Suggested-by: Maarten Lankhorst <[email protected]>
Signed-off-by: Thomas Hellström <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Signed-off-by: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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