[Toybox] [toybox] cleanup in 'netstat.c'

[Lipi C. H. Lee]

Hi, Rob.

I cleaned up the code in 'netstat.c' as belows.

 - Adjust to 80 columns
 - remove a useless function(strchr_nul), variable, type casting and
compile warnings(fgets)
 - clean up netstat command option condition
 - change useless double pointer to single point and dynamic memory
allocation to static one
 - fix a ambiguous return type and typo

Can you review it?

Thanks

Lipi
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