bpf: Remove unneeded memset in queue_stack_map creation

__GFP_ZERO will clear the memory, so we don't need to memset it.
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20220810151840.16394-2-laoar.shao@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

kernel/bpf/queue_stack_maps.c

@@ -78,8 +78,6 @@ static struct bpf_map *queue_stack_map_alloc(union bpf_attr *attr)
 	if (!qs)
 		return ERR_PTR(-ENOMEM);
 
-	memset(qs, 0, sizeof(*qs));
-
 	bpf_map_init_from_attr(&qs->map, attr);
 
 	qs->size = size;