ndb - post-merge fix 5.0 to 5.0-ndb: number of frags if --without-big-tables

sql/ha_ndbcluster.cc:
  calculate frags with (ulonglong)max_rows in case --without-big-tables

sql/ha_ndbcluster.cc

@@ -4175,10 +4175,15 @@ static void ndb_set_fragmentation(NDBTAB &tab, TABLE *form, uint pk_length)
       acc_row_size+= 4 + /*safety margin*/ 4;
 #endif
     ulonglong acc_fragment_size= 512*1024*1024;
+    /*
+     * if not --with-big-tables then max_rows is ulong
+     * the warning in this case is misleading though
+     */
+    ulonglong big_max_rows = (ulonglong)max_rows;
 #if MYSQL_VERSION_ID >= 50100
-    no_fragments= (max_rows*acc_row_size)/acc_fragment_size+1;
+    no_fragments= (big_max_rows*acc_row_size)/acc_fragment_size+1;
 #else
-    no_fragments= ((max_rows*acc_row_size)/acc_fragment_size+1
+    no_fragments= ((big_max_rows*acc_row_size)/acc_fragment_size+1
                    +1/*correct rounding*/)/2;
 #endif
   }