Work around for libsafe "error".

CHANGES

@@ -3,6 +3,11 @@
 
  Changes between 0.9.6 and 0.9.7  [xx XXX 2000]
 
+  *) Use the cached encoding of an X509_NAME structure rather than
+     copying it. This is apparently the reason for the libsafe "errors"
+     but the code is actually correct.
+     [Steve Henson]
+
   *) Disable stdin buffering in load_cert (apps/apps.c) so that no certs are
      skipped when using openssl x509 multiple times on a single input file,
      e.g. "(openssl x509 -out cert1; openssl x509 -out cert2) <certs".

crypto/x509/x509_cmp.c

@@ -199,19 +199,10 @@ unsigned long X509_NAME_hash(X509_NAME *x)
 	{
 	unsigned long ret=0;
 	unsigned char md[16];
-	unsigned char str[256],*p,*pp;
-	int i;
-
-	i=i2d_X509_NAME(x,NULL);
-	if (i > sizeof(str))
-		p=OPENSSL_malloc(i);
-	else
-		p=str;
 
-	pp=p;
-	i2d_X509_NAME(x,&pp);
-	MD5((unsigned char *)p,i,&(md[0]));
-	if (p != str) OPENSSL_free(p);
+	/* Make sure X509_NAME structure contains valid cached encoding */
+	i2d_X509_NAME(x,NULL);
+	EVP_Digest(x->bytes->data, x->bytes->length, md, NULL, EVP_md5());
 
 	ret=(	((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
 		((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)