USB: Fix debug output of ark3116

Fix debug output. Previously, it would output "0xFFFFFFB0" on 32-bit
archs (and probably "0xFFFFFFFFFFFFFFB0" on 64-bits), because buf is
taken as signed char, which is promoted to signed int, while %x always
expects an unsigned int.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
index ea2175bb2274..fe437125f14b 100644
--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -63,7 +63,8 @@ static inline void ARK3116_RCV(struct usb_serial *serial, int seq,
                                  request, requesttype, value, index,
                                  buf, 0x0000001, 1000);
         if (result)
-                dbg("%03d < %d bytes [0x%02X]", seq, result, buf[0]);
+                dbg("%03d < %d bytes [0x%02X]", seq, result,
+                    ((unsigned char *)buf)[0]);
         else
                 dbg("%03d < 0 bytes", seq);
 }