Constify i2s_ASN1_INTEGER, X509V3_get_d2i

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1300)

crypto/x509v3/v3_utl.c

@@ -108,7 +108,7 @@ char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
     return strtmp;
 }
 
-char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
+char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
 {
     BIGNUM *bntmp = NULL;
     char *strtmp = NULL;

include/openssl/x509v3.h

@@ -604,7 +604,7 @@ int X509V3_add_value_bool(const char *name, int asn1_bool,
                           STACK_OF(CONF_VALUE) **extlist);
 int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
                          STACK_OF(CONF_VALUE) **extlist);
-char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *meth, ASN1_INTEGER *aint);
+char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *meth, const ASN1_INTEGER *aint);
 ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *meth, const char *value);
 char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *meth, ASN1_ENUMERATED *aint);
 char *i2s_ASN1_ENUMERATED_TABLE(X509V3_EXT_METHOD *meth,