[rtems commit] taskmode.c: Ensure all error checking is done before modifying executing

[Sebastian Huber]

This breaks tm04 and tm20 with --enable-smp.

On 06/12/17 19:49, Joel Sherrill wrote:
> Module:    rtems
> Branch:    master
> Commit:    d2711c37f1f189863bd679064cd37a7b0f700494
> Changeset: http://git.rtems.org/rtems/commit/?id=d2711c37f1f189863bd679064cd37a7b0f700494
>
> Author:    Joel Sherrill <joel at rtems.org>
> Date:      Tue Dec  5 09:54:56 2017 -0600
>
> taskmode.c: Ensure all error checking is done before modifying executing
>
> Also use single conditional expressions to simplify error checking.
> Combined, this all resulted in a block of SMP enabled error checking.
>
> Updates #3000.

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