[Bug 258382] comms/ser2net: uses 100% of CPU

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258382

            Bug ID: 258382
           Summary: comms/ser2net: uses 100% of CPU
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: egypcio@FreeBSD.org
          Reporter: chrisj@rtems.org
             Flags: maintainer-feedback?(egypcio@FreeBSD.org)
          Assignee: egypcio@FreeBSD.org

# uname -v
FreeBSD 13.0-RELEASE-p1 #0: Wed May 26 22:15:09 UTC 2021    
root@amd64-builder.daemonology.net:/usr/obj/usr/src/amd64.amd64/sys/GENERIC 

I have a hardware board (Xilinx Ultrascale Cortex-A53) with a USB FDTI serial
console configured at 115200 baud and if I connect using telnet or the
`rtems-test` command `ser2net` seems to spin with 100% CPU load.

I ran `ser2net` from the command line with a number of threads and a number of
CPUs seems to max at 100%.

The serial output `set2net` sents over the telnet connection has dropped data.
Observing the data stream from the RTEMS applications running on the Utlrascale
hardware it seems the dropped data is from the start of a block. The UART has a
TX FIFO and it is being used. 

Note, the `rtems-test` command uses Python's `telnetlib` to connect using the
telnet protocol.

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