text: Don't track binding in struct text_backend

The binding is only used for preventing launch, and we've already got the
pid for that.

With multiple seats there are multiple bindings, so if the most recent
binding unbinds it will clear the pointer, so using it like this is risky
anyway.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>

src/text-backend.c

@@ -100,7 +100,6 @@ struct text_backend {
 
 	struct {
 		char *path;
-		struct wl_resource *binding;
 		struct weston_process process;
 		struct wl_client *client;
 
@@ -831,12 +830,9 @@ static void
 unbind_input_method(struct wl_resource *resource)
 {
 	struct input_method *input_method = wl_resource_get_user_data(resource);
-	struct text_backend *text_backend = input_method->text_backend;
 
 	input_method->input_method_binding = NULL;
 	input_method->context = NULL;
-
-	text_backend->input_method.binding = NULL;
 }
 
 static void
@@ -870,8 +866,6 @@ bind_input_method(struct wl_client *client,
 	wl_resource_set_implementation(resource, NULL, input_method,
 				       unbind_input_method);
 	input_method->input_method_binding = resource;
-
-	text_backend->input_method.binding = resource;
 }
 
 static void
@@ -957,9 +951,6 @@ handle_input_method_sigchld(struct weston_process *process, int status)
 static void
 launch_input_method(struct text_backend *text_backend)
 {
-	if (text_backend->input_method.binding)
-		return;
-
 	if (!text_backend->input_method.path)
 		return;