MDEV-9560 Mariadb 10.1 Crashes when replicating from 10.0

don't crash in debug builds. issue an error message on corrupt event

sql/log_event.cc

@@ -11394,7 +11394,10 @@ Rows_log_event::write_row(rpl_group_info *rgi,
 
   /* unpack row into table->record[0] */
   if ((error= unpack_current_row(rgi)))
+  {
+    table->file->print_error(error, MYF(0));
     DBUG_RETURN(error);
+  }
 
   if (m_curr_row == m_rows_buf && !invoke_triggers)
   {
@@ -12453,8 +12456,8 @@ Update_rows_log_event::do_exec_row(rpl_group_info *rgi)
       We need to read the second image in the event of error to be
       able to skip to the next pair of updates
     */
-    m_curr_row= m_curr_row_end;
-    unpack_current_row(rgi);
+    if ((m_curr_row= m_curr_row_end))
+      unpack_current_row(rgi);
     return error;
   }
 

sql/rpl_record.cc

@@ -185,7 +185,7 @@ pack_row(TABLE *table, MY_BITMAP const* cols,
 
    @retval HA_ERR_GENERIC
    A generic, internal, error caused the unpacking to fail.
-   @retval ER_SLAVE_CORRUPT_EVENT
+   @retval HA_ERR_CORRUPT_EVENT
    Found error when trying to unpack fields.
  */
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
@@ -322,7 +322,7 @@ unpack_row(rpl_group_info *rgi,
                       "Could not read field '%s' of table '%s.%s'",
                       f->field_name, table->s->db.str,
                       table->s->table_name.str);
-          DBUG_RETURN(ER_SLAVE_CORRUPT_EVENT);
+          DBUG_RETURN(HA_ERR_CORRUPT_EVENT);
         }
       }