anv: fix use after free
Once mem->bo is removed from the cache, it is likely to be freed. Signed-off-by:Lionel Landwerlin <lionel.g.landwerlin@intel.com> Fixes: b80930a6 ("anv: add support for VK_EXT_memory_budget") Reviewed-by:
Eric Engestrom <eric.engestrom@intel.com> (cherry picked from commit 43596e5f)