Don't use written parameter of macro directly

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

Author: sjaeckel

src/headers/tomcrypt_pk.h

@@ -739,9 +739,10 @@ typedef struct ltc_asn1_list_ {
 #define LTC_SET_ASN1_CUSTOM_PRIMITIVE(list, index, Class, Tag, Type, Data, Size)          \
    do {                                                                                   \
       int LTC_TMPVAR(SACP) = (index);                                                     \
+      ltc_asn1_list *LTC_TMPVAR(SACP_list) = (list);                        \
       LTC_SET_ASN1(list, LTC_TMPVAR(SACP), LTC_ASN1_CUSTOM_TYPE, Data, Size);             \
       LTC_SET_ASN1_IDENTIFIER(list, LTC_TMPVAR(SACP), Class, LTC_ASN1_PC_PRIMITIVE, Tag); \
-      list[LTC_TMPVAR(SACP)].used = (int)(Type);                                          \
+      LTC_TMPVAR(SACP_list)[LTC_TMPVAR(SACP)].used = (int)(Type);                                          \
    } while (0)
 
 extern const char*          der_asn1_class_to_string_map[];