t-reftable-readwrite: use free_names() instead of a for loop

free_names() as defined by reftable/basics.{c,h} frees a NULL
terminated array of malloced strings along with the array itself.
Use this function instead of a for loop to free such an array.

Mentored-by: Patrick Steinhardt <[email protected]>
Mentored-by: Christian Couder <[email protected]>
Signed-off-by: Chandra Pratap <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Chandra Pratap

t/unit-tests/t-reftable-readwrite.c

@@ -7,6 +7,7 @@ license that can be found in the LICENSE file or at
 */
 
 #include "test-lib.h"
+#include "reftable/basics.h"
 #include "reftable/blocksource.h"
 #include "reftable/reader.h"
 #include "reftable/reftable-error.h"
@@ -413,7 +414,6 @@ static void t_table_read_api(void)
 	struct reftable_reader rd = { 0 };
 	struct reftable_block_source source = { 0 };
 	int err;
-	int i;
 	struct reftable_log_record log = { 0 };
 	struct reftable_iterator it = { 0 };
 
@@ -432,10 +432,8 @@ static void t_table_read_api(void)
 	check_int(err, ==, REFTABLE_API_ERROR);
 
 	strbuf_release(&buf);
-	for (i = 0; i < N; i++)
-		reftable_free(names[i]);
+	free_names(names);
 	reftable_iterator_destroy(&it);
-	reftable_free(names);
 	reader_close(&rd);
 	strbuf_release(&buf);
 }
@@ -498,9 +496,7 @@ static void t_table_read_write_seek(int index, int hash_id)
 	reftable_iterator_destroy(&it);
 
 	strbuf_release(&buf);
-	for (i = 0; i < N; i++)
-		reftable_free(names[i]);
-	reftable_free(names);
+	free_names(names);
 	reader_close(&rd);
 }