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kernel/qio: make readblist() offset of type ulong as the rest

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

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

@@ -283,7 +283,7 @@

 void		randominit(void);

 ulong		randomread(void*, ulong);

 void		rdb(void);

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

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

 int		readnum(ulong, char*, ulong, ulong, int);

 int		readstr(ulong, char*, ulong, char*);

 void		ready(Proc*);

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

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

@@ -816,9 +816,9 @@

  *  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){