cleanup:networking/interface.c

[walter harms]

this is a cleanup patch that does not change code only rearrange it.
the whole idea is to have better readable code.
all size changes are due to the compiler.

NTL it would be nice if someone who used IPV6 could confirm that is still works.

size interface.o.new  interface.o
   text    data     bss     dec     hex filename
   8626       0      25    8651    21cb interface.o.new
   8853       0      25    8878    22ae interface.o


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