perf stat: Fix +- nan% in --no-aggr runs

perf stat: Fix +- nan% in --no-aggr runs

Without this patch, running:

$ sudo ./perf stat -r20 --no-aggr -a perl -e '$i++ for 1..100000'

I get computations like this:

CPU0             12.488247 task-clock                #    1.224 CPUs utilized            ( +-  -nan% )
CPU1             12.488909 task-clock                #    1.225 CPUs utilized            ( +-  -nan% )
CPU2             12.500221 task-clock                #    1.226 CPUs utilized            ( +-  -nan% )
CPU3             12.481713 task-clock                #    1.224 CPUs utilized            ( +-  -nan% )

but with patch, I get:

CPU0              8.233682 task-clock                #    0.754 CPUs utilized            ( +-  0.00% )
CPU1              8.226318 task-clock                #    0.754 CPUs utilized            ( +-  0.00% )
CPU2              8.210737 task-clock                #    0.752 CPUs utilized            ( +-  0.00% )
CPU3              8.201691 task-clock                #    0.751 CPUs utilized            ( +-  0.00% )

Note that without --no-aggr, I get non-0 statistics both before and after patch:

        231.986022 task-clock                #    4.030 CPUs utilized            ( +-  0.97% )
               212 context-switches          #    0.001 M/sec                    ( +- 12.07% )
                 9 CPU-migrations            #    0.000 M/sec                    ( +- 25.80% )
               466 page-faults               #    0.002 M/sec                    ( +-  3.23% )
       174,318,593 cycles                    #    0.751 GHz                      ( +-  1.06% )

I couldnt see anything wrong in the caller, so fixed it in
stddev_stats().  ISTM that 0.00 is better than nan, since perf stat was
passed -A (--no-aggr) so no standard deviation should be expected, and
nan is suggestive of a deeper error.

When running with --no-aggr, perhaps we should suppress the statistics
printing entirely, or do so when they are 0.00.

Link: http://lkml.kernel.org/r/1315437244-3788-3-git-send-email-jim.cromie@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>