The error message changes from

    open FILENAME failed

to

    Could not open 'FILENAME': REASON

where REASON is the value of strerror(errno).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/usb/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index 8dd2ce415e..47d42ca3c1 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -262,7 +262,7 @@ static void usb_qdev_realize(DeviceState *qdev, Error **errp)
         int fd = qemu_open_old(dev->pcap_filename,
                                O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0666);
         if (fd < 0) {
-            error_setg(errp, "open %s failed", dev->pcap_filename);
+            error_setg_file_open(errp, errno, dev->pcap_filename);
             usb_qdev_unrealize(qdev);
             return;
         }
-- 
2.49.0