ASN1_STRING_to_UTF8 missing initializer.

(Imported from upstream's b85d461cdf)

Change-Id: I85f620a5a924c3fe73aa394b39ab8ab343c4c7eb

crypto/x509/a_strex.c

@@ -554,6 +554,7 @@ int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in)
 	mbflag |= MBSTRING_FLAG;
 	stmp.data = NULL;
 	stmp.length = 0;
+	stmp.flags = 0;
 	ret = ASN1_mbstring_copy(&str, in->data, in->length, mbflag, B_ASN1_UTF8STRING);
 	if(ret < 0) return ret;
 	*out = stmp.data;