[crypto] Expose asn1_grow()

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/crypto/asn1.c

  * @v extra		Extra space to prepend
  * @ret rc		Return status code
  */
-static int asn1_grow ( struct asn1_builder *builder, size_t extra ) {
+int asn1_grow ( struct asn1_builder *builder, size_t extra ) {
 	size_t new_len;
 	void *new;
 

src/include/ipxe/asn1.h

 				      struct asn1_algorithm **algorithm );
 extern int asn1_generalized_time ( const struct asn1_cursor *cursor,
 				   time_t *time );
+extern int asn1_grow ( struct asn1_builder *builder, size_t extra );
 extern int asn1_prepend_raw ( struct asn1_builder *builder, const void *data,
 			      size_t len );
 extern int asn1_prepend ( struct asn1_builder *builder, unsigned int type,