base: change ret fieldname to error_code in request struct

lib/base/heimbase-svc.h

@@ -73,6 +73,6 @@
     /* auditing key/value store */                              \
     heim_dict_t kv;                                             \
     heim_dict_t attributes;                                     \
-    int32_t ret
+    int32_t error_code
 
 #endif /* HEIMBASE_SVC_H */

lib/base/log.c

@@ -1042,7 +1042,7 @@ heim_audit_trail(heim_svc_req_desc r, heim_error_code ret, const char *retname)
 #define CASE(x)	case x : retval = #x; break
     if (retname) {
         retval = retname;
-    } else switch (ret ? ret : r->ret) {
+    } else switch (ret ? ret : r->error_code) {
     CASE(ENOMEM);
     CASE(ENOENT);
     CASE(EACCES);