Pool io stat shows wlentime instead of rlentime

Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Elling <Richard.Elling@RichardElling.com>
Closes #652 
Closes #651

module/spl/spl-kstat.c

@@ -264,7 +264,7 @@ kstat_seq_show_io(struct seq_file *f, kstat_io_t *kip)
                    kip->nread, kip->nwritten,
                    kip->reads, kip->writes,
                    kip->wtime, kip->wlentime, kip->wlastupdate,
-                   kip->rtime, kip->wlentime, kip->rlastupdate,
+                   kip->rtime, kip->rlentime, kip->rlastupdate,
                    kip->wcnt,  kip->rcnt);
 
         return 0;