[patch] fix the pmiostat output samples's count issue

["Wu, Liming" <wulm.fnst@xxxxxxxxxxxxxx>]

Hi

There are only 2 samples when you specified  3  as follows. 
# pmiostat -s 3
# Device      rrqm/s  wrqm/s     r/s    w/s    rkB/s    wkB/s avgrq-sz avgqu-sz 
  await r_await w_await   %util
sda             0.00    0.00    0.00   0.00     0.00     0.00    0.000    0.000 
   0.00    0.00    0.00    0.00
sda             0.00    0.00    0.00   0.00     0.00     0.00    0.000    0.000 
   0.00    0.00    0.00    0.00

src/python/pcp/pmcc.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
 
diff --git a/src/python/pcp/pmcc.py b/src/python/pcp/pmcc.py
index 0117b26..e041860 100644
--- a/src/python/pcp/pmcc.py
+++ b/src/python/pcp/pmcc.py
@@ -619,9 +619,9 @@ class MetricGroupManager(dict, MetricCache):
             self.fetch()
             while True:
                 self._counter += 1
-                if samples == 0 or self._counter <= samples:
+                if samples == 0 or self._counter <= samples + 1:
                     self._printer.report(self)
-                if self._counter == samples:
+                if self._counter == samples + 1:
                     break
                 timer.sleep()
                 self.fetch()

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wuliming
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