ssl: remove unnecessary GetOpenFile() check in SSLSocket#syswrite*

This is no longer necessary as of commit 22e601a (Remove usage of
IO internals, 2023-05-29).

Author: rhenium

ext/openssl/ossl_ssl.c

@@ -2018,7 +2018,6 @@ ossl_ssl_write_internal_safe(VALUE _args)
     VALUE opts = args[2];
 
     SSL *ssl;
-    rb_io_t *fptr;
     int num, nonblock = opts != Qfalse;
     VALUE cb_state;
 
@@ -2027,7 +2026,6 @@ ossl_ssl_write_internal_safe(VALUE _args)
         rb_raise(eSSLError, "SSL session is not started yet");
 
     VALUE io = rb_attr_get(self, id_i_io);
-    GetOpenFile(io, fptr);
 
     /* SSL_write(3ssl) manpage states num == 0 is undefined */
     num = RSTRING_LENINT(str);