CVE-2016-2225 Make sure to always terminate decoded string
This change is being provide to comply to Yocto compatiblility.
(From OE-Core rev: 093d76f3f4a385aae46304bd572ce1545c6bcf33)
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>