kexec_tools_klibc_2.0.2: update x86_vfscanf.patch

The POSIX standard
http://pubs.opengroup.org/onlinepubs/009695399/functions/fgets.html


states:

If the stream is at end-of-file ... fgets() shall return a null pointer...
If a read error occurs ... fgets() shall return a null pointer...

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>