Grissiom 6bb2c0f2ea Revert "serial: set the errno if and only if in thread context"
This reverts commit 07bd09fc0fc256e5c53ad3c6157802fd94c9910c.
The validation of the context is done with in `rt_set_errno`. So it's
safe to call it here.
2013-10-25 21:23:15 +08:00
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