digest: remove optional parameter from OpenSSL::Digest#finish

OpenSSL::Digest#finish overrides Digest::Instance#finish and is called
from the Digest::Class framework in the digest library. This method is
not supposed to take any arguments, as suggested by the RDoc comment for
Digest::Instance#finish.

It is a private method and not exposed to users. Let's remove it.

This optional parameter has been there since r15602 in Ruby trunk,
which converted OpenSSL::Digest to the current state, a subclass of
Digest::Class.

ext/openssl/ossl_digest.c

@@ -218,24 +218,15 @@ ossl_digest_update(VALUE self, VALUE data)
  *
  */
 static VALUE
-ossl_digest_finish(int argc, VALUE *argv, VALUE self)
+ossl_digest_finish(VALUE self)
 {
     EVP_MD_CTX *ctx;
     VALUE str;
-    int out_len;
 
     GetDigest(self, ctx);
     rb_scan_args(argc, argv, "01", &str);
-    out_len = EVP_MD_CTX_size(ctx);
-
-    if (NIL_P(str)) {
-        str = rb_str_new(NULL, out_len);
-    } else {
-        StringValue(str);
-        rb_str_modify(str);
-        rb_str_resize(str, out_len);
-    }
 
+    str = rb_str_new(NULL, EVP_MD_CTX_size(ctx));
     if (!EVP_DigestFinal_ex(ctx, (unsigned char *)RSTRING_PTR(str), NULL))
 	ossl_raise(eDigestError, "EVP_DigestFinal_ex");
 
@@ -418,7 +409,7 @@ Init_ossl_digest(void)
     rb_define_method(cDigest, "reset", ossl_digest_reset, 0);
     rb_define_method(cDigest, "update", ossl_digest_update, 1);
     rb_define_alias(cDigest, "<<", "update");
-    rb_define_private_method(cDigest, "finish", ossl_digest_finish, -1);
+    rb_define_private_method(cDigest, "finish", ossl_digest_finish, 0);
     rb_define_method(cDigest, "digest_length", ossl_digest_size, 0);
     rb_define_method(cDigest, "block_length", ossl_digest_block_length, 0);