REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4001 This commit adds NULL check on memory allocation of the size for FileName in ASCII string format at PosixFileSetInfo(). Signed-off-by: Miki Shindo <miki.shindo@intel.com> Cc: Andrew Fish <afish@apple.com> Reviewed-by: Ray Ni <ray.ni@intel.com>