[PATCH] writev_emu: stop on the first incomplete write

[Sjoerd Simons]

Hey,

See attached patch :). Our library got someone confused in some cases
when the push function couldn't write out, we'd see call traces like
this:

push (X bytes): return Y bytes (Y < X)
push (Z bytes): return -EAGAIN
push (X - Y bytes): abort!

As after an EAGAIN the push function expect to be called again with the
same amount of bytes. 
-- 
Sjoerd Simons <sjoerd.simons at collabora.co.uk>
Collabora Ltd.
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