anv: fix format string in error message

Fixes: 9775894f ("anv: Move size check from anv_bo_cache_import() to caller (v2)")
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
(cherry picked from commit 7abf65ae)