drm/i915: delete shadow "ret" variable

This "ret" declaration shadows an existing "ret" variable at the top of
the function.  Delete it.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220127085115.GD25644@kili
Fixes: f6c466b8 ("drm/i915: Add support for moving fence waiting")