richedit: Prevent integer overflow in wrapping code with no wrap

[Dylan Smith]

The integer nAvailWidth get set to the largest possible number to avoid
wrapping when wrapping is turned off. This means that adding anything
to this integer will cause an overflow. This integer overflow can be
handled by subtracting from the left side of the comparison rather than
adding to the right side which overflows.

This patch attempts to fix Bug 15020.
---
 dlls/riched20/wrap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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