msi:MsiSourceListEnumMediaDisksW: free original string, not substring

[Dan Kegel]

Found via valgrind:

 Invalid free() / delete / delete[]
    by msi_free (msipriv.h:965)
    by MsiSourceListEnumMediaDisksW (source.c:324)
  Address 0x7f01b2ac is 12 bytes inside a block of size 54 alloc'd
    by msi_alloc (msipriv.h:945)
    by MsiSourceListEnumMediaDisksW (source.c:273)

'data' is freed later, so don't touch it.
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