client code and replication slave code, as far as LOAD DATA INFILE and
other queries' execution is concerned. Duplication of code leads to
replication bugs, because the replication duplicate lags much behind.
Fix for 2 Valgrind errors on slave replicating LOAD DATA INFILE
  - one serious (causing a random test failure in rpl_loaddata in 5.0)
  - one not serious (theoretically a bug but not dangerous): uninited thd->row_count


sql/log_event.cc:
  Fix for 2 Valgrind errors:
  - one serious (causing a random test failure in rpl_loaddata in 5.0): uninited lex in replic of LOAD DATA INFILE on slave
  - one not serious (theoretically a bug but not dangerous): uninited thd->row_count in replication of LOAD DATA INFILE on slave.
  Sanja is likely to rework the fix to the 1st problem tomorrow.