Fixed cleanup_load_tmpdir() which deleted nothing.

sql/log_event.cc:
  - cleanup_load_tmpdir() did not work at all because it forgot to indicate
  the directory part of the path when calling my_delete().
  - A misplaced R_POS_OFFSET (fortunately this was no bug as this constant is 0).
sql/sql_repl.cc:
  - fix fake_rotate_event() for pos>4G (correction of a change I pushed yesterday).

sql/log_event.cc

@@ -168,12 +168,15 @@ static void cleanup_load_tmpdir()
   uint i;
   if (!(dirp=my_dir(slave_load_tmpdir,MYF(MY_WME))))
     return;
-
+  char fname[FN_REFLEN];
   for (i=0 ; i < (uint)dirp->number_off_files; i++)
   {
     file=dirp->dir_entry+i;
     if (is_prefix(file->name,"SQL_LOAD-"))
-      my_delete(file->name, MYF(0));
+    {
+      fn_format(fname,file->name,slave_load_tmpdir,"",0);
+      my_delete(fname, MYF(0));
+    }
   }
 
   my_dirend(dirp);
@@ -813,7 +816,7 @@ Rotate_log_event::Rotate_log_event(const char* buf, int event_len,
 int Rotate_log_event::write_data(IO_CACHE* file)
 {
   char buf[ROTATE_HEADER_LEN];
-  int8store(buf, pos + R_POS_OFFSET);
+  int8store(buf + R_POS_OFFSET, pos);
   return (my_b_safe_write(file, (byte*)buf, ROTATE_HEADER_LEN) ||
 	  my_b_safe_write(file, (byte*)new_log_ident, (uint) ident_len));
 }

sql/sql_repl.cc

@@ -68,9 +68,12 @@ static int fake_rotate_event(NET* net, String* packet, char* log_file_name,
   int4store(header + LOG_POS_OFFSET, 0);
   
   packet->append(header, sizeof(header));
-  /* We need to split the next statement because of problem with cxx */
-  int4store(buf,position);
-  int4store(buf+4,0);
+  /* 
+     An old comment said talked about a need for splitting the int8store below
+     into 2 int4store because of a problem with cxx; I can't understand that as
+     we already use int8store in Rotatel_log_event::write_data().
+  */
+  int8store(buf+R_POS_OFFSET,position);
   packet->append(buf, ROTATE_HEADER_LEN);
   packet->append(p,ident_len);
   if (my_net_write(net, (char*)packet->ptr(), packet->length()))