drm/i915/gem: fix i915_gem_object_lookup_rcu() kernel-doc parameter name

drivers/gpu/drm/i915/gem/i915_gem_object.h:94: warning: Function parameter or member 'file' not described in 'i915_gem_object_lookup_rcu'
drivers/gpu/drm/i915/gem/i915_gem_object.h:94: warning: Excess function parameter 'filp' description in 'i915_gem_object_lookup_rcu'
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/80c96863b7a0755aaa07efb49bcccd9ba620c6d7.1683041799.git.jani.nikula@intel.com

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -80,7 +80,7 @@ __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj);
 
 /**
  * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
- * @filp: DRM file private date
+ * @file: DRM file private date
  * @handle: userspace handle
  *
  * Returns: