test/dm: clear unit test failure count each run

The ut command prints a test failure count each time it is executed.
This is stored in a global variable which is never reset. Consequently,
the printed failure count accumulates across runs. Fix this by clearing
the counter each time "ut" is invoked.

Signed-off-by: Stephen Warren <[email protected]>
Acked-by: Simon Glass <[email protected]>

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