[PATCH] vhost-user-scsi: avoid unlink(NULL) with fd passing

[Stefan Hajnoczi <stefanha@redhat.com>]

Commit 747421e949fc1eb3ba66b5fcccdb7ba051918241 ("Implements Backend
Program conventions for vhost-user-scsi") introduced fd-passing support
as part of implementing the vhost-user backend program conventions.

When fd passing is used the UNIX domain socket path is NULL and we must
not call unlink(2).

Fixes: Coverity CID 1488353
Fixes: 747421e949fc1eb3ba66b5fcccdb7ba051918241 ("Implements Backend Program conventions for vhost-user-scsi")
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 contrib/vhost-user-scsi/vhost-user-scsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/contrib/vhost-user-scsi/vhost-user-scsi.c b/contrib/vhost-user-scsi/vhost-user-scsi.c
index b2c0f98253..08335d4b2b 100644
--- a/contrib/vhost-user-scsi/vhost-user-scsi.c
+++ b/contrib/vhost-user-scsi/vhost-user-scsi.c
@@ -433,7 +433,9 @@ out:
     if (vdev_scsi) {
         g_main_loop_unref(vdev_scsi->loop);
         g_free(vdev_scsi);
-        unlink(opt_socket_path);
+        if (opt_socket_path) {
+            unlink(opt_socket_path);
+        }
     }
     if (csock >= 0) {
         close(csock);
-- 
2.35.1