tree: do not return error when filtering out subsystems

The filter is set by the caller, and just modifies the tree.
It does not invalidate the scanning, so we shouldn't return
an error.

Signed-off-by: Hannes Reinecke <[email protected]>

Author: hreinecke

src/nvme/tree.c

@@ -562,7 +562,6 @@ static int nvme_scan_subsystem(struct nvme_root *r, const char *name,
 	if (f && !f(s)) {
 		nvme_msg(r, LOG_DEBUG, "filter out subsystem %s\n", name);
 		__nvme_free_subsystem(s);
-		return -1;
 	}
 
 	return 0;