drm/xe/pf: Fix kernel-doc warning in migration_save_consume

drm/xe/pf: Fix kernel-doc warning in migration_save_consume

The kernel-doc for xe_sriov_pf_migration_save_consume() contained
multiple "Return:" sections, causing a warning.
Fix it by removing the extra line.

Fixes: 67df4a5cbc583 ("drm/xe/pf: Add data structures and handlers for migration rings")
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251114134030.1795947-1-michal.winiarski@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit 562b0f254d8b1515a1c8d2a650f940d4f719300e)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>