kcm: use BPF_PROG_RUN

Instead of invoking struct bpf_prog::bpf_func directly, use the
BPF_PROG_RUN macro.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

net/kcm/kcmsock.c

@@ -379,7 +379,7 @@ static int kcm_parse_func_strparser(struct strparser *strp, struct sk_buff *skb)
 	struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
 	struct bpf_prog *prog = psock->bpf_prog;
 
-	return (*prog->bpf_func)(skb, prog->insnsi);
+	return BPF_PROG_RUN(prog, skb);
 }
 
 static int kcm_read_sock_done(struct strparser *strp, int err)