Remove "dummy" BIO create and destroy functions

They aren't needed if all they do is set bio->init = 1 and zero other
fields that are already zeroed
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5223)

crypto/bio/bf_null.c

@@ -21,8 +21,6 @@ static int nullf_read(BIO *h, char *buf, int size);
 static int nullf_puts(BIO *h, const char *str);
 static int nullf_gets(BIO *h, char *str, int size);
 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
-static int nullf_new(BIO *h);
-static int nullf_free(BIO *data);
 static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
 static const BIO_METHOD methods_nullf = {
     BIO_TYPE_NULL_FILTER,
@@ -36,8 +34,8 @@ static const BIO_METHOD methods_nullf = {
     nullf_puts,
     nullf_gets,
     nullf_ctrl,
-    nullf_new,
-    nullf_free,
+    NULL,
+    NULL,
     nullf_callback_ctrl,
 };
 
@@ -46,26 +44,6 @@ const BIO_METHOD *BIO_f_null(void)
     return &methods_nullf;
 }
 
-static int nullf_new(BIO *bi)
-{
-    bi->init = 1;
-    bi->ptr = NULL;
-    bi->flags = 0;
-    return 1;
-}
-
-static int nullf_free(BIO *a)
-{
-    if (a == NULL)
-        return 0;
-    /*-
-    a->ptr=NULL;
-    a->init=0;
-    a->flags=0;
-    */
-    return 1;
-}
-
 static int nullf_read(BIO *b, char *out, int outl)
 {
     int ret = 0;

crypto/bio/bss_null.c

@@ -17,8 +17,6 @@ static int null_read(BIO *h, char *buf, int size);
 static int null_puts(BIO *h, const char *str);
 static int null_gets(BIO *h, char *str, int size);
 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
-static int null_new(BIO *h);
-static int null_free(BIO *data);
 static const BIO_METHOD null_method = {
     BIO_TYPE_NULL,
     "NULL",
@@ -31,8 +29,8 @@ static const BIO_METHOD null_method = {
     null_puts,
     null_gets,
     null_ctrl,
-    null_new,
-    null_free,
+    NULL,
+    NULL,
     NULL,                     /* null_callback_ctrl */
 };
 
@@ -41,21 +39,6 @@ const BIO_METHOD *BIO_s_null(void)
     return &null_method;
 }
 
-static int null_new(BIO *bi)
-{
-    bi->init = 1;
-    bi->num = 0;
-    bi->ptr = (NULL);
-    return 1;
-}
-
-static int null_free(BIO *a)
-{
-    if (a == NULL)
-        return 0;
-    return 1;
-}
-
 static int null_read(BIO *b, char *out, int outl)
 {
     return 0;