[patch] Fix compilation warning with UST enabled

[Yao Qi]

I installed UST 0.11 and URCU 0.5.3 on my machine, and build gdbserver
with UST.  There is one warning on ignored return value of 'write', and
this simple patch is to fix this warning.

It is obvious, and I'll commit it later today.

-- 
Yao (齐尧)
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