winmm: msiSendStringW: Don't free substring after original string has already been free'd

[Zac Brown]

Found via valgrind:

Invalid free() / delete / delete[]
     at  notify_free (heap.c:199)
     by  RtlFreeHeap (heap.c:1284)
     by  mciSendStringW (mci.c:1446)
   Address 0x7f01d714 is not stack'd, malloc'd or (recently) free'd

'verb' is already free'd, so don't free a substring('devAlias') of 'verb'.
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