mshtml: txtrange.c: Initialize variables in a couple structs

[Zac Brown]

Initialize variables in a couple structs.

Fixes valgrind errors like:
Conditional jump or move depends on uninitialised value(s)
     at  fill_nodestr (txtrange.c:287)
     by  dompos_addref (txtrange.c:469)
     by  next_char (txtrange.c:614)
     by  find_word_end (txtrange.c:891)
     by  HTMLTxtRange_expand (txtrange.c:1303)
     by  _test_range_expand (dom.c:670)
     by  test_txtrange (dom.c:1224)
     ...
   Uninitialised value was created by a stack allocation
     at  next_char (txtrange.c:574)
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