netdevsim: make functions nsim_bpf_create_prog and nsim_bpf_destroy_prog static

Functions nsim_bpf_create_prog and nsim_bpf_destroy_prog are local to the
source and do not need to be in global scope, so make them static.

Cleans up sparse warnings:
symbol 'nsim_bpf_create_prog' was not declared. Should it be static?
symbol 'nsim_bpf_destroy_prog' was not declared. Should it be static?
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/netdevsim/bpf.c

@@ -197,7 +197,7 @@ static int nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
 	return 0;
 }
 
-int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
+static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
 {
 	struct nsim_bpf_bound_prog *state;
 	char name[16];
@@ -232,7 +232,7 @@ int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
 	return 0;
 }
 
-void nsim_bpf_destroy_prog(struct bpf_prog *prog)
+static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
 {
 	struct nsim_bpf_bound_prog *state;