Remove some code for a contributor that we cannot find

This removes some code because we cannot trace the original contributor
to get their agreement for the licence change (original commit e03ddfae).

After this change there will be numerous failures in the test cases until
someone rewrites the missing code.

All *_free functions should accept a NULL parameter. After this change
the following *_free functions will fail if a NULL parameter is passed:

BIO_ACCEPT_free()
BIO_CONNECT_free()
BN_BLINDING_free()
BN_CTX_free()
BN_MONT_CTX_free()
BN_RECP_CTX_free()
BUF_MEM_free()
COMP_CTX_free()
ERR_STATE_free()
TXT_DB_free()
X509_STORE_free()
ssl3_free()
ssl_cert_free()
SSL_SESSION_free()
SSL_free()

[skip ci]
Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/5757)

crypto/bio/bss_acpt.c

@@ -101,9 +101,6 @@ static BIO_ACCEPT *BIO_ACCEPT_new(void)
 
 static void BIO_ACCEPT_free(BIO_ACCEPT *a)
 {
-    if (a == NULL)
-        return;
-
     OPENSSL_free(a->param_addr);
     OPENSSL_free(a->param_serv);
     BIO_ADDRINFO_free(a->addr_first);

crypto/bio/bss_conn.c

@@ -232,9 +232,6 @@ BIO_CONNECT *BIO_CONNECT_new(void)
 
 void BIO_CONNECT_free(BIO_CONNECT *a)
 {
-    if (a == NULL)
-        return;
-
     OPENSSL_free(a->param_hostname);
     OPENSSL_free(a->param_service);
     BIO_ADDRINFO_free(a->addr_first);

crypto/bn/bn_blind.c

@@ -80,9 +80,6 @@ BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod)
 
 void BN_BLINDING_free(BN_BLINDING *r)
 {
-    if (r == NULL)
-        return;
-
     BN_free(r->A);
     BN_free(r->Ai);
     BN_free(r->e);

crypto/bn/bn_ctx.c

@@ -156,8 +156,6 @@ BN_CTX *BN_CTX_secure_new(void)
 
 void BN_CTX_free(BN_CTX *ctx)
 {
-    if (ctx == NULL)
-        return;
 #ifdef BN_CTX_DEBUG
     {
         BN_POOL_ITEM *pool = ctx->pool.head;

crypto/bn/bn_mont.c

@@ -217,9 +217,6 @@ void BN_MONT_CTX_init(BN_MONT_CTX *ctx)
 
 void BN_MONT_CTX_free(BN_MONT_CTX *mont)
 {
-    if (mont == NULL)
-        return;
-
     BN_clear_free(&(mont->RR));
     BN_clear_free(&(mont->N));
     BN_clear_free(&(mont->Ni));

crypto/bn/bn_recp.c

@@ -32,9 +32,6 @@ BN_RECP_CTX *BN_RECP_CTX_new(void)
 
 void BN_RECP_CTX_free(BN_RECP_CTX *recp)
 {
-    if (recp == NULL)
-        return;
-
     BN_free(&(recp->N));
     BN_free(&(recp->Nr));
     if (recp->flags & BN_FLG_MALLOCED)

crypto/buffer/buffer.c

@@ -42,9 +42,6 @@ BUF_MEM *BUF_MEM_new(void)
 
 void BUF_MEM_free(BUF_MEM *a)
 {
-    if (a == NULL)
-        return;
-
     if (a->data != NULL) {
         if (a->flags & BUF_MEM_FLAG_SECURE)
             OPENSSL_secure_clear_free(a->data, a->max);

crypto/comp/comp_lib.c

@@ -45,9 +45,6 @@ const char *COMP_get_name(const COMP_METHOD *meth)
 
 void COMP_CTX_free(COMP_CTX *ctx)
 {
-    if (ctx == NULL)
-        return;
-
     if (ctx->meth->finish != NULL)
         ctx->meth->finish(ctx);
 

crypto/err/err.c

@@ -256,9 +256,6 @@ static void ERR_STATE_free(ERR_STATE *s)
 {
     int i;
 
-    if (s == NULL)
-        return;
-
     for (i = 0; i < ERR_NUM_ERRORS; i++) {
         err_clear_data(s, i);
     }

crypto/txt_db/txt_db.c

@@ -284,9 +284,6 @@ void TXT_DB_free(TXT_DB *db)
     int i, n;
     char **p, *max;
 
-    if (db == NULL)
-        return;
-
     if (db->index != NULL) {
         for (i = db->num_fields - 1; i >= 0; i--)
             lh_OPENSSL_STRING_free(db->index[i]);

crypto/x509/x509_lu.c

@@ -178,9 +178,6 @@ void X509_STORE_free(X509_STORE *vfy)
     STACK_OF(X509_LOOKUP) *sk;
     X509_LOOKUP *lu;
 
-    if (vfy == NULL)
-        return;
-
     CRYPTO_DOWN_REF(&vfy->references, &i, vfy->lock);
     REF_PRINT_COUNT("X509_STORE", vfy);
     if (i > 0)

ssl/s3_lib.c

@@ -3312,7 +3312,7 @@ int ssl3_new(SSL *s)
 
 void ssl3_free(SSL *s)
 {
-    if (s == NULL || s->s3 == NULL)
+    if (s->s3 == NULL)
         return;
 
     ssl3_cleanup_key_block(s);

ssl/ssl_cert.c

@@ -225,9 +225,6 @@ void ssl_cert_free(CERT *c)
 {
     int i;
 
-    if (c == NULL)
-        return;
-
     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
     REF_PRINT_COUNT("CERT", c);
     if (i > 0)

ssl/ssl_lib.c

@@ -1125,9 +1125,6 @@ void SSL_free(SSL *s)
 {
     int i;
 
-    if (s == NULL)
-        return;
-
     CRYPTO_DOWN_REF(&s->references, &i, s->lock);
     REF_PRINT_COUNT("SSL", s);
     if (i > 0)

ssl/ssl_sess.c

@@ -785,9 +785,6 @@ void SSL_SESSION_free(SSL_SESSION *ss)
 {
     int i;
 
-    if (ss == NULL)
-        return;
-
     CRYPTO_DOWN_REF(&ss->references, &i, ss->lock);
     REF_PRINT_COUNT("SSL_SESSION", ss);
     if (i > 0)