x86/xen: fix SLS mitigation in xen_hypercall_iret()
The backport of upstream patch a2796dff62d6 ("x86/xen: don't do PV iret hypercall through hypercall page") missed to adapt the SLS mitigation config check from CONFIG_MITIGATION_SLS to CONFIG_SLS. Signed-off-by:Juergen Gross <jgross@suse.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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