richedit: Initialize fields for windowless richedit controls.

[Dylan Smith]

The field exStyleFlags is initialized in ME_CreatTextHost for only windowed
richedit controls. The field rcFormat is initialized by
ITextHost::TxClientRect which is application code, so should be
pre-initialized before calling this function.

Caught by valgrind.
---
 dlls/riched20/txtsrv.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
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diff --git a/dlls/riched20/txtsrv.c b/dlls/riched20/txtsrv.c
index 4006acd..7ab2af4 100644
--- a/dlls/riched20/txtsrv.c
+++ b/dlls/riched20/txtsrv.c
@@ -87,6 +87,8 @@ HRESULT WINAPI CreateTextServices(IUnknown  * pUnkOuter,
    ITextImpl->pMyHost = pITextHost;
    ITextImpl->lpVtbl = &textservices_Vtbl;
    ITextImpl->editor = ME_MakeEditor(pITextHost, FALSE);
+   ITextImpl->editor->exStyleFlags = 0;
+   ITextImpl->editor->rcFormat = (RECT){0,0,0,0};
    ME_HandleMessage(ITextImpl->editor, WM_CREATE, 0, 0, TRUE, &hres);
 
    if (pUnkOuter)