usb: Do not prefix error_setg() messages with "Error: "
Because it produces beauties like (qemu) usb_add mouse Failed to initialize USB device 'usb-mouse': Error: tried to attach usb device QEMU USB Mouse to a bus with no free ports Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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