richedit: Unsigned cast char to avoid EOF equality (Fixes bug 14674)

[Dylan Smith]

When the rtf reader encounters a character with a value of 0xFF
(e.g. the russian letter "ya" in cope page 1251) it must be stored as an
unsigned value to avoid being interpreted as -1 which is used to
indicate EOF.
---
 dlls/riched20/reader.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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