libyaml: Security Advisory - libyaml - CVE-2014-9130

https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9130

The patch comes from:
https://bitbucket.org/xi/libyaml/commits/2b9156756423e967cfd09a61d125d883fca6f4f2



Removed invalid simple key assertion (thank to Jonathan Gray)

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>