MDEV-22721: Fix GCC 5.3.1 -Wconversion

storage/innobase/lock/lock0lock.cc

@@ -354,15 +354,15 @@ lock_check_trx_id_sanity(
   ut_ad(rec_offs_validate(rec, index, offsets));
   ut_ad(!rec_is_metadata(rec, *index));
 
-	trx_id_t	max_trx_id = trx_sys.get_max_trx_id();
+  trx_id_t max_trx_id= trx_sys.get_max_trx_id();
   ut_ad(max_trx_id || srv_force_recovery >= SRV_FORCE_NO_UNDO_LOG_SCAN);
 
-	if (UNIV_LIKELY(max_trx_id) && UNIV_UNLIKELY(trx_id >= max_trx_id)) {
-		lock_report_trx_id_insanity(
-			trx_id, rec, index, offsets, max_trx_id);
+  if (UNIV_LIKELY(max_trx_id != 0) && UNIV_UNLIKELY(trx_id >= max_trx_id))
+  {
+    lock_report_trx_id_insanity(trx_id, rec, index, offsets, max_trx_id);
     return false;
   }
-	return(true);
+  return true;
 }
 
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