=head1 RETURN VALUES
X509V3_EXT_d2i() and *X509V3_get_d2i() return a pointer to an extension
-specific structure of B<NULL> if an error occurs.
+specific structure or B<NULL> if an error occurs.
X509V3_EXT_i2d() returns a pointer to an B<X509_EXTENSION> structure
or B<NULL> if an error occurs.