xen: fix mismerge in masking pte flags
Looks like a mismerge/misapply dropped one of the cases of pte flag masking for Xen. Also, only mask the flags for present ptes. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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