David van Moolenbroek 818c405ae1 LOG: fix bugs in userland write handler
- report correct number of bytes written;
- correctly return partial writes on failure;
- do not overwrite result if there is a pending read.

Change-Id: I92aeeaee1eccb47c2aa2b6666a2f560c3cb17f42
2015-07-26 11:56:36 +00:00
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