drm/xe: fix missing 'xe_vm_put'

Fix memleak caused by missing xe_vm_put

Fixes: 852856e3 ("drm/xe: Use reserved copy engine for user binds on faulting devices")
Signed-off-by: Dafna Hirschfeld <dhirschfeld@habana.ai>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240901044227.1177211-1-dhirschfeld@habana.ai


Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>