pipewire-pulse: set correct errno values

errno should be set to the positive errno value.

This does not cause problems except for the pulse-server where the
errno value is negated and returned as an error result.

src/modules/module-protocol-pulse/module.c

@@ -176,7 +176,7 @@ static struct module *create_module(struct client *client, const char *name, con
 
 	info = find_module_info(name);
 	if (info == NULL) {
-		errno = -ENOENT;
+		errno = ENOENT;
 		return NULL;
 	}
 	module = info->create(impl, args);