Do not truncate integers on 32-bit systems in Rows_event_tracker

commit 3dc3ab1 introduced Rows_event_tracker, using a mismatch of size_t (the native register width) and my_off_t (the file offset width, usually 64 bits). Use my_off_t both in member fields and member functions.

Author: dr-m

sql/rpl_mi.h

@@ -139,11 +139,11 @@ typedef struct st_rows_event_tracker
  my_off_t first_seen;
  my_off_t last_seen;
  bool stmt_end_seen;
- void update(const char* file_name, size_t pos,
+ void update(const char* file_name, my_off_t pos,
  const char* buf,
  const Format_description_log_event *fdle);
  void reset();
- bool check_and_report(const char* file_name, size_t pos);
+ bool check_and_report(const char* file_name, my_off_t pos);
 } Rows_event_tracker;
 
 /*****************************************************************************

sql/slave.cc

@@ -7650,7 +7650,7 @@ void Rows_event_tracker::reset()
  well as the end-of-statement status of the last one.
 */
 
-void Rows_event_tracker::update(const char* file_name, size_t pos,
+void Rows_event_tracker::update(const char* file_name, my_off_t pos,
  const char* buf,
  const Format_description_log_event *fdle)
 {
@@ -7675,7 +7675,7 @@ void Rows_event_tracker::update(const char* file_name, size_t pos,
  false otherwise.
 */
 bool Rows_event_tracker::check_and_report(const char* file_name,
- size_t pos)
+ my_off_t pos)
 {
  if (last_seen)
  {