x86/microcode/AMD: Sanitize apply_microcode_early_amd()

x86/microcode/AMD: Sanitize apply_microcode_early_amd()

Make it simply return bool to denote whether it found a container or not
and return the pointer to the container and its size in the handed-in
container pointer instead, as returning a struct was just silly.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Jürgen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: http://lkml.kernel.org/r/20161218164414.9649-3-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>