[BusyBox] [PATCH] dc should not print result by default

[Paul Whittaker]

Product: Busybox
Version: 1.00rc1

As already discussed on this list, the dc applet's behaviour isn't 
compatible with GNU dc in that busybox dc prints a result by default and 
the GNU dc doesn't.  As a trivial example, compare the output of:

    echo "1 1 +" | dc

and

    echo "1 1 +" | busybox dc

Trivial fix attached.
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