qemu: fix CVE-2016-7909

qemu: fix CVE-2016-7909

Backport patch to fix CVE-2016-7909 of qemu.

Ref:
https://security-tracker.debian.org/tracker/CVE-2016-7909

(From OE-Core rev: 126783ca25a5ae9daf87ac563239fbff4696a682)

(From OE-Core rev: 469267010b43a1c114e22009c9ac68f36c22f896)

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>