Add helper functions for info_callback and msg_callback.

This is getting a little repetitive.

Change-Id: Ib0fa8ab10149557c2d728b88648381b9368221d9
Reviewed-on: https://boringssl-review.googlesource.com/8126
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

ssl/ssl_lib.c

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index ec30dcf..9c8e723 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -2711,6 +2711,27 @@
   return 1;
 }
 
+void ssl_do_info_callback(const SSL *ssl, int type, int value) {
+  void (*cb)(const SSL *ssl, int type, int value) = NULL;
+  if (ssl->info_callback != NULL) {
+    cb = ssl->info_callback;
+  } else if (ssl->ctx->info_callback != NULL) {
+    cb = ssl->ctx->info_callback;
+  }
+
+  if (cb != NULL) {
+    cb(ssl, type, value);
+  }
+}
+
+void ssl_do_msg_callback(SSL *ssl, int is_write, int version, int content_type,
+                         const void *buf, size_t len) {
+  if (ssl->msg_callback != NULL) {
+    ssl->msg_callback(is_write, version, content_type, buf, len, ssl,
+                      ssl->msg_callback_arg);
+  }
+}
+
 int SSL_CTX_sess_connect(const SSL_CTX *ctx) { return 0; }
 int SSL_CTX_sess_connect_good(const SSL_CTX *ctx) { return 0; }
 int SSL_CTX_sess_connect_renegotiate(const SSL_CTX *ctx) { return 0; }