{cifsiostat,iostat,mpstat,pidstat, and sar} --dec report values from single alphabet other than the defined values 0,1,2

Issue

• {cifsiostat,iostat,mpstat,pidstat, and sar} --dec display values from single alphabet other than the defined value of 0,1,2.

• As per the man page --dec should accept only 0,1, and 2.

--dec={ 0 | 1 | 2 }
              Specify the number of decimal places to use (0 to 2, default value is 2).

• When a single alphabet is passed it accepts and showed the output similar to what we get when a 0 is passed.

# iostat --dec=a
Linux 5.14.0-162.12.1.el9_1.x86_64 (hostname)   02/23/2023  _x86_64_    (2 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
              0       0       0       0       0      99

Device             tps    kB_read/s    kB_wrtn/s    kB_dscd/s    kB_read    kB_wrtn    kB_dscd
dm-0                 2           65           11            0     825642     135273          0
dm-1                 1            1            6            0       7212      70124          0
vda                  2           68           19            0     858398     241494          0