Fix docs.

doc/crypto/BIO_f_base64.pod

@@ -55,16 +55,15 @@ to standard output:
 Read Base64 encoded data from standard input and write the decoded
 data to standard output:
 
- BIO *bio, *b64, bio_out;
+ BIO *bio, *b64, *bio_out;
  char inbuf[512];
  int inlen;
- char message[] = "Hello World \n";
 
  b64 = BIO_new(BIO_f_base64());
  bio = BIO_new_fp(stdin, BIO_NOCLOSE);
  bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
  bio = BIO_push(b64, bio);
- while((inlen = BIO_read(bio, inbuf, strlen(message))) > 0) 
+ while((inlen = BIO_read(bio, inbuf, 512) > 0) 
 	BIO_write(bio_out, inbuf, inlen);
 
  BIO_free_all(bio);