[PATCH][MSP430] Fix return code error in simulator implemenations of write.c.

[Martin Young]

Hello,

In the MSP430 simulator implementation of write() in write.c the wrong
local is used as the return code (it's returning the result of the
last invocation of write_chunk() (variable c) rather than the
aggregate write size (variable rv). This causes issues for users of
write().

Patch included as attachment to avoid whitespace issues.

I do do not have the ability to apply patch this myself.

Regards,
-Martin.
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