Remove file before writing to it.

mysql-test/t/csv.test

@@ -1424,6 +1424,7 @@ DROP TABLE test_repair_table2;
 
 # Corrupt csv file and see if we can repair it
 CREATE TABLE test_repair_table3 ( val integer ) ENGINE = CSV;
+--remove_file $MYSQLTEST_VARDIR/master-data/test/test_repair_table3.CSV
 --write_file $MYSQLTEST_VARDIR/master-data/test/test_repair_table3.CSV
 "1"
 "4"
@@ -1476,6 +1477,7 @@ CREATE TABLE test_repair_table5 (
 ) ENGINE = CSV;
 
 # Corrupt a table -- put a file with wrong # of columns
+--remove_file $MYSQLTEST_VARDIR/master-data/test/test_repair_table5.CSV
 --write_file $MYSQLTEST_VARDIR/master-data/test/test_repair_table5.CSV
 "1","101","IBM"
 EOF
@@ -1629,6 +1631,7 @@ insert into bug22080_1 values(2,'string');
 insert into bug22080_1 values(3,'string');
 
 # Create first corrupt file as described in bug report
+--remove_file $MYSQLTEST_VARDIR/master-data/test/bug22080_2.CSV
 --write_file $MYSQLTEST_VARDIR/master-data/test/bug22080_2.CSV
 1,"string"
 2","string"
@@ -1636,6 +1639,7 @@ insert into bug22080_1 values(3,'string');
 EOF
 
 # Create second corrupt file as described in bug report
+--remove_file $MYSQLTEST_VARDIR/master-data/test/bug22080_3.CSV
 --write_file $MYSQLTEST_VARDIR/master-data/test/bug22080_3.CSV
 1,"string"
 "2",string"
@@ -1696,6 +1700,7 @@ check table t1;
 drop table t1;
 
 create table t1(a int, b int) engine=csv;
+--remove_file $MYSQLTEST_VARDIR/master-data/test/t1.CSV
 --write_file $MYSQLTEST_VARDIR/master-data/test/t1.CSV
 1, 1E-2
 -2E2, .9