Tweak ssl_early_callback_init.

It really should take a few more parameters and save a bit of
long-winded initialization work.

Change-Id: I2823f0aa82be39914a156323f6f32b470b6d6a3b
Reviewed-on: https://boringssl-review.googlesource.com/8876
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

ssl/t1_lib.c

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 7549240..b1e3b13 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -202,9 +202,14 @@
   return ret;
 }
 
-char ssl_early_callback_init(struct ssl_early_callback_ctx *ctx) {
-  CBS client_hello, session_id, cipher_suites, compression_methods, extensions;
+int ssl_early_callback_init(SSL *ssl, struct ssl_early_callback_ctx *ctx,
+                            const uint8_t *in, size_t in_len) {
+  memset(ctx, 0, sizeof(*ctx));
+  ctx->ssl = ssl;
+  ctx->client_hello = in;
+  ctx->client_hello_len = in_len;
 
+  CBS client_hello, session_id, cipher_suites, compression_methods, extensions;
   CBS_init(&client_hello, ctx->client_hello, ctx->client_hello_len);
 
   if (/* Skip client version. */