test/parser: cleanup parser allocations on exit

We should talloc_free the parser list once we're done, enabling
valgrind's leak check. Before:

 [jk@pablo parser]$ valgrind ./test-null
 ...
 ==9330== HEAP SUMMARY:
 ==9330==     in use at exit: 288 bytes in 3 blocks
 ==9330==   total heap usage: 11 allocs, 8 frees, 1,177 bytes allocated

After:

 [jk@pablo parser]$ valgrind ./test-null
 ...
 ==9940== HEAP SUMMARY:
 ==9940==     in use at exit: 0 bytes in 0 blocks
 ==9940==   total heap usage: 11 allocs, 11 frees, 1,177 bytes allocated
 ==9940==
 ==9940== All heap blocks were freed -- no leaks are possible

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/test/parser/utils.c b/test/parser/utils.c
index 9a6b2e1..6f78c2f 100644
--- a/test/parser/utils.c
+++ b/test/parser/utils.c
@@ -32,6 +32,14 @@ void __register_parser(struct parser *parser)
 	list_add(&parsers, &i->list);
 }
 
+static void __attribute__((destructor)) __cleanup_parsers(void)
+{
+	struct p_item *item, *tmp;
+
+	list_for_each_entry_safe(&parsers, item, tmp, list)
+		talloc_free(item);
+}
+
 static struct discover_device *test_create_device_simple(
 		struct discover_context *ctx)
 {