Clean up the fifo_open() implementation:

        Restructure the error handling portion of the resource allocation
        code to eliminate duplicated code.

        Test for the O_NONBLOCK && fi_readers == 0 case before incrementing
        fi_writers and modifying the the socket flag to avoid having to
        undo these operations in this error case.

        Restructure and simplify the code that handles blocking opens.

There should be no change to functionality.

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