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xen: fix mtrr dummy functions

--- a/sys/src/9/xen/archxen.c

+++ b/sys/src/9/xen/archxen.c

@@ -97,7 +97,8 @@

 void	i8259off(void)	{}

 int	i8259vecno(int)	{ return 0; }

 int	mtrrprint(char*, long) { return 0; }

-int	mtrr(uvlong, uvlong, char *) { return 0; }

+char*	mtrr(uvlong, uvlong, char *) { return nil; }

+void	mtrrsync(void) {}

 /*

  * XXX until fpsave is debugged

--- a/sys/src/9/xen/fns.h

+++ b/sys/src/9/xen/fns.h

@@ -78,8 +78,9 @@

 int	mmukmapsync(ulong);

 #define	mmunewpage(x)

 ulong*	mmuwalk(ulong*, ulong, int, int);

-int	mtrr(uvlong, uvlong, char *);

+char*	mtrr(uvlong, uvlong, char *);

 int	mtrrprint(char *, long);

+void	mtrrsync(void);

 void	outb(int, int);

 void	outsb(int, void*, int);

 void	outs(int, ushort);