Little netboot patch

[benoit.guillon]

Hello,

Here is a little patch in order to fix the following:

- the ARRAY_SIZE macro is no more needed here,
- use of cfgpath to have the actual config path to apply for mac *and* ip  
lookup,
- no need to free a buffer big enough, and besides malloc(9) was not  
enough ("/etc/" missed),
- use of intermediate length variables to avoid unneeded calls to strlen()  
and strrchr().

Hope i didn't introduced new bugs ;-)

Regards,
BG
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