Makes STACK_OF(SCT)* parameter of i2d_SCT_LIST const

Reviewed-by: NEmilia Käsper <emilia@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>

crypto/ct/ct_oct.c

@@ -442,7 +442,7 @@ STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
     return sk;
 }
 
-int i2d_SCT_LIST(STACK_OF(SCT) *a, unsigned char **out)
+int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **out)
 {
     ASN1_OCTET_STRING oct;
     int len;

include/openssl/ct.h

@@ -414,7 +414,7 @@ STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
  * Returns < 0 on error, >= 0 indicating bytes written (or would have been)
  * on success.
  */
-__owur int i2d_SCT_LIST(STACK_OF(SCT) *a, unsigned char **pp);
+__owur int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
 
 /*
  * Parses an SCT list in DER format and returns it.