Fix missing cert length prefix.

Change-Id: I5275ade79f4f27c46bf1b73ee1288f34dc661e67
Reviewed-on: https://boringssl-review.googlesource.com/8544
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/ssl/ssl_cert.c b/ssl/ssl_cert.c
index b608c73..a361af2 100644
--- a/ssl/ssl_cert.c
+++ b/ssl/ssl_cert.c
@@ -460,7 +460,7 @@
   }
 
   if (no_chain) {
-    if (!ssl_add_cert_to_cbb(&child, x)) {
+    if (!ssl_add_cert_with_length(&child, x)) {
       return 0;
     }