comctl32/treeview: always allocate the pszText field

[Jan de Mooij]

Hi,

treeview.c has this comment in the header:
* Note2: All items always! have valid (allocated) pszText field.

This is currently not true if an item is added without the TVIF_TEXT flag.
FileZilla 3 for example adds a dummy item without TVIF_TEXT flag and
later tries to retrieve the text, resulting in a crash.

My patch makes sure we always allocate the pszText field, so it's safe
for other functions to access it.
I ran the test on XP and 98 SE.

This fixes bug 11194.
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