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kern: make readblist() offset of type ulong as the rest

--- a/kern/fns.h

+++ b/kern/fns.h

@@ -229,7 +229,7 @@

 void		putswap(Page*);

 ulong		pwait(Waitmsg*);

 Label*	pwaserror(void);

-long		readblist(Block*, uchar *, long, long);

+long		readblist(Block*, uchar*, long, ulong);

 int		qaddlist(Queue*, Block*);

 Block*		qbread(Queue*, int);

 long		qbwrite(Queue*, Block*);

--- a/kern/qio.c

+++ b/kern/qio.c

@@ -815,9 +815,9 @@

  *  return number of copied bytes.

  */

 long

-readblist(Block *b, uchar *p, long n, long o)

+readblist(Block *b, uchar *p, long n, ulong o)

 {

-	long m, r;

+	ulong m, r;

 	r = 0;

 	while(n > 0 && b != nil){