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kernel: export freepages() function so it can be used in mmurelease()

--- a/sys/src/9/port/page.c

+++ b/sys/src/9/port/page.c

@@ -82,15 +82,14 @@

 		wakeup(&palloc.pwait[1]);

 }

-static void

+void

 freepages(Page *head, Page *tail, ulong np)

 {

-	lock(&palloc);

+	assert(palloc.Lock.p == up);

 	tail->next = palloc.head;

 	palloc.head = head;

 	palloc.freecount += np;

 	pagechaindone();

-	unlock(&palloc);

 }

 ulong

@@ -142,8 +141,11 @@

 	unlock(i);

 	putimage(i);

-	if(np > 0)

+	if(np > 0){

+		lock(&palloc);

 		freepages(fh, ft, np);

+		unlock(&palloc);

+	}

 	return np;

 }

@@ -238,8 +240,11 @@

 		decref(p);

 		return;

 	}

-	if(decref(p) == 0)

+	if(decref(p) == 0){

+		lock(&palloc);

 		freepages(p, p, 1);

+		unlock(&palloc);

+	}

 }

 void

--- a/sys/src/9/port/portfns.h

+++ b/sys/src/9/port/portfns.h

@@ -117,6 +117,7 @@

 void		freeb(Block*);

 void		freeblist(Block*);

 int		freebroken(void);

+void		freepages(Page*, Page*, ulong);

 void		freepte(Segment*, Pte*);

 void		getcolor(ulong, ulong*, ulong*, ulong*);

 uintptr		getmalloctag(void*);