Bug#36526369 MySQL server crashes on UPDATE after ALTER TABLE

- Post push fix for memory leak

Change-Id: I034bb20c71dfe3ae467e762b2dd7c7f95fb0679b

Author: mayprasa

storage/innobase/mtr/mtr0log.cc

@@ -846,6 +846,9 @@ bool mlog_open_and_write_index(mtr_t *mtr, const byte *rec,
   }
 
   if (!mlog_open(mtr, alloc, log_ptr)) {
+    if (is_versioned) {
+      delete[] fields_with_changed_order;
+    }
     /* logging is disabled */
     return (false);
   }