Push destroy fns to backend (#302)

* Make cubeb_device_info_destroy private.

* Move implementation of cubeb_device_collection_destroy to cubeb_utils.

* Move cubeb_device_collection_destroy implementation into backend.

Push the responsiblity for destroying device collections to the
backends so they can make independent choices on how to handle
allocation.

* Unstage space changes

1 files changed, 2 insertions, 2 deletions

diff --git a/test/common.h b/test/common.h
index 35368fa..374b9ac 100644
--- a/test/common.h
+++ b/test/common.h
@@ -82,7 +82,7 @@ int has_available_input_device(cubeb * ctx)
 
   if (devices->count == 0) {
     fprintf(stderr, "no input device available, skipping test.\n");
-    cubeb_device_collection_destroy(devices);
+    cubeb_device_collection_destroy(ctx, devices);
     return 0;
   }
 
@@ -96,7 +96,7 @@ int has_available_input_device(cubeb * ctx)
         "available, skipping\n");
   }
 
-  cubeb_device_collection_destroy(devices);
+  cubeb_device_collection_destroy(ctx, devices);
   return !!input_device_available;
 }