riched20: The wParam parameter to WM_GETTEXT contains the number of characters, not the number of bytes.

[Robert Shearman]

Fix up some places in the WM_GETTEXT handler where it was assumed that 
it was a byte count.
---
  dlls/riched20/editor.c |    6 +++---
  1 files changed, 3 insertions(+), 3 deletions(-)
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