weston-log: rename weston_log_subscriber::destroy to destroy_subscription

weston_log_subscriber has a member named destroy. There are
other structs (weston_output, for instance) that have this
member, and by convention it is a pointer to a function
that destroys the struct.

In weston_log_subscriber it is being used to destroy
subscriptions of the debug protocol, and not the subscriber,
so this name is misleading. Rename it to destroy_subscription.

Signed-off-by: Leandro Ribeiro <leandrohr@riseup.net>

libweston/weston-log-file.c

@@ -79,7 +79,7 @@ weston_log_subscriber_create_log(FILE *dump_to)
 
 
 	file->base.write = weston_log_file_write;
-	file->base.destroy = NULL;
+	file->base.destroy_subscription = NULL;
 	file->base.complete = NULL;
 
 	wl_list_init(&file->base.subscription_list);

libweston/weston-log-flight-rec.c

@@ -241,7 +241,7 @@ weston_log_subscriber_create_flight_rec(size_t size)
 		return NULL;
 
 	flight_rec->base.write = weston_log_flight_recorder_write;
-	flight_rec->base.destroy = NULL;
+	flight_rec->base.destroy_subscription = NULL;
 	flight_rec->base.complete = NULL;
 	wl_list_init(&flight_rec->base.subscription_list);
 

libweston/weston-log-internal.h

@@ -54,7 +54,7 @@ struct weston_log_subscriber {
 	void (*write)(struct weston_log_subscriber *sub, const char *data, size_t len);
 	/** For the type of streams that required additional destroy operation
 	 * for destroying the stream */
-	void (*destroy)(struct weston_log_subscriber *sub);
+	void (*destroy_subscription)(struct weston_log_subscriber *sub);
 	/** For the type of streams that can inform the 'consumer' part that
 	 * write operation has been terminated/finished and should close the
 	 * stream.

libweston/weston-log-wayland.c

@@ -180,7 +180,7 @@ stream_create(struct weston_log_context *log_ctx, const char *name,
 	stream->resource = stream_resource;
 
 	stream->base.write = weston_log_debug_wayland_write;
-	stream->base.destroy = weston_log_debug_wayland_to_destroy;
+	stream->base.destroy_subscription = weston_log_debug_wayland_to_destroy;
 	stream->base.complete = weston_log_debug_wayland_complete;
 	wl_list_init(&stream->base.subscription_list);
 

libweston/weston-log.c

@@ -712,8 +712,8 @@ weston_log_scope_destroy(struct weston_log_scope *scope)
 
 	wl_list_for_each_safe(sub, sub_tmp, &scope->subscription_list, source_link) {
 		/* destroy each subscription */
-		if (sub->owner->destroy)
-			sub->owner->destroy(sub->owner);
+		if (sub->owner->destroy_subscription)
+			sub->owner->destroy_subscription(sub->owner);
 
 		weston_log_subscription_destroy(sub);
 	}