Remove x509->name.

Every X509 object, when parsed, would pretty-print the subject and stash
the result in x509->name. This field was removed in upstream OpenSSL and
all uses I found have now been fixed. Remove this to reduce unnecessary
work in the X.509 parser.

Update-Note: instead of x509->name, use X509_NAME_oneline and
X509_get_subject_name.

Change-Id: I1d1e69bed7429d59125a8bdea5cbba391cd1028c
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41904
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>

crypto/x509/x_x509.c

diff --git a/crypto/x509/x_x509.c b/crypto/x509/x_x509.c
index 010b625..ff0dc34 100644
--- a/crypto/x509/x_x509.c
+++ b/crypto/x509/x_x509.c
@@ -98,7 +98,6 @@
     switch (operation) {
 
     case ASN1_OP_NEW_POST:
-        ret->name = NULL;
         ret->ex_flags = 0;
         ret->ex_pathlen = -1;
         ret->skid = NULL;
@@ -140,10 +139,6 @@
             return 0;
         }
 
-        /* TODO(davidben): Remove this field once the few external accesses are
-         * removed. */
-        OPENSSL_free(ret->name);
-        ret->name = X509_NAME_oneline(ret->cert_info->subject, NULL, 0);
         break;
     }
 
@@ -158,7 +153,6 @@
         GENERAL_NAMES_free(ret->altname);
         NAME_CONSTRAINTS_free(ret->nc);
         CRYPTO_BUFFER_free(ret->buf);
-        OPENSSL_free(ret->name);
         break;
 
     }

include/openssl/x509.h

diff --git a/include/openssl/x509.h b/include/openssl/x509.h
index fb6d0bc..d58e3ca 100644
--- a/include/openssl/x509.h
+++ b/include/openssl/x509.h
@@ -230,7 +230,6 @@
   X509_ALGOR *sig_alg;
   ASN1_BIT_STRING *signature;
   CRYPTO_refcount_t references;
-  char *name;
   CRYPTO_EX_DATA ex_data;
   // These contain copies of various extension values
   long ex_pathlen;