With Python 3 create_string_buffer needs a bytes() not a str() but as we were
catching all exceptions nobody noticed.
[ YOCTO #9910 ]
(Bitbake rev: 6576a9a95486c28a01d4211b4a33cc3e2c55a7cc)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>