winmm/tests: initialize MIXERLINECONTROLSA before calling mixerGetLineControlsA

[Dan Kegel]

The test wanted to see what happened if you didn't
initialize the struct's size field to the right value,
but it forgot to set it to any value.   Clear the
whole struct; this sets the size field to a wrong value
so we still get the error the test was after,
and gets rid of the Valgrind warning:

 Conditional jump or move depends on uninitialised value(s)
    at  mixerGetLineControlsA (winmm.c:518)
    by  mixer_test_deviceA (mixer.c:516)
    by  mixer_testsA (mixer.c:1001)
  Uninitialised value was created by a stack allocation
    at  mixer_test_deviceA (mixer.c:352)
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