tree: do not open blk device on default

The fd is not needed anymore if the kernel exposes all necessary sysfs
entries to fully scan the nvme subsystem. Thus do not alwyas open the
blk device and do it only when necessary.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

src/nvme/tree.c

@@ -2478,7 +2478,6 @@ static void nvme_ns_set_generic_name(struct nvme_ns *n, const char *name)
 static nvme_ns_t nvme_ns_open(const char *sys_path, const char *name)
 {
 	struct nvme_ns *n;
-	int fd;
 
 	n = calloc(1, sizeof(*n));
 	if (!n) {
@@ -2489,10 +2488,6 @@ static nvme_ns_t nvme_ns_open(const char *sys_path, const char *name)
 	n->fd = -1;
 	n->name = strdup(name);
 
-	fd = nvme_ns_get_fd(n);
-	if (fd < 0)
-		goto free_ns;
-
 	nvme_ns_set_generic_name(n, name);
 
 	if (nvme_ns_init(sys_path, n) != 0)
@@ -2505,7 +2500,6 @@ static nvme_ns_t nvme_ns_open(const char *sys_path, const char *name)
 	return n;
 
 free_ns:
-	nvme_ns_release_fd(n);
 	free(n->generic_name);
 	free(n->name);
 	free(n);