Avoid pointer type value compared with 0 to make code clear.

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
---
 tools/usb/testusb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/usb/testusb.c b/tools/usb/testusb.c
index 69c3ead..474bae8 100644
--- a/tools/usb/testusb.c
+++ b/tools/usb/testusb.c
@@ -482,7 +482,7 @@ int main (int argc, char **argv)
 	}
 	if (not)
 		return 0;
-	if (testdevs && testdevs->next == 0 && !device)
+	if (testdevs && !testdevs->next && !device)
 		device = testdevs->name;
 	for (entry = testdevs; entry; entry = entry->next) {
 		int	status;
-- 
2.7.4