Don't use *from++ in tolower as this is implemented as a macro on some

platforms. Thanks to Shayne Murray <Shayne.Murray@Polycom.com> for
reporting this issue.

crypto/asn1/x_name.c

@@ -464,7 +464,8 @@ static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in)
 			}
 		else
 			{
-			*to++ = tolower(*from++);
+			*to++ = tolower(*from);
+			from++;
 			i++;
 			}
 		}