lsusb-t: if a driver is not bound to an interface, report "[none]"

For the output of 'lsusb -t' if a driver is not bound to an interface,
the result looks odd.  Fix that up by printing out "[none]" instead.

This changes the output of a line that previous looked like:
        |__ Port 004: Dev 006, If 0, Class=[unknown], Driver=, 12M
to be:
        |__ Port 004: Dev 006, If 0, Class=[unknown], Driver=[none], 12M

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/lsusb-t.c b/lsusb-t.c
index b119414..966da7d 100644
--- a/lsusb-t.c
+++ b/lsusb-t.c
@@ -357,6 +357,8 @@ static void add_usb_interface(const char *d_name)
 			p = strrchr(driver, '/');
 			if (p)
 				snprintf(e->driver, sizeof(e->driver), "%s", p + 1);
+		} else {
+			snprintf(e->driver, sizeof(e->driver), "[none]");
 		}
 	} else
 		printf("Can not read driver link for '%s': %d\n", d_name, l);