bpf: Fix incorrect integer literal used for marking scratched stack.

env->scratched_stack_slots is a 64-bit value, we should use ULL
instead of UL literal values.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christy Lee <christylee@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/r/20220108005854.658596-1-christylee@fb.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>