[Toybox] netcat -f bug

[Yi-Yo Chiang]

Hi,
The -f option for netcat doesn't seem to be doing anything right now. It is
missing a call to pollinate() after opening the specified device file.
The patch adds back that line of pollinate().
Also make sure that the timeout handler is not armed for -f mode as -f
shouldn't timeout. File open() should just succeed or fail immediately.
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