x86/bugs: Concentrate bug reporting into a separate function

x86/bugs: Concentrate bug reporting into a separate function

commit d1059518b4789cabe34bb4b714d07e6089c82ca1 upstream.

Those SysFS functions have a similar preamble, as such make common
code to handle them.

Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
[bwh: Backported to 3.16: s/X86_FEATURE_PTI/X86_FEATURE_KAISER/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>