staging: nvec: use %*ph to dump small buffers

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: ac100@lists.launchpad.net
Acked-by: Julian Andres Klode <jak@jak-linux.org>
Acked-By: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>