bug fixes

[Leonardo Rangel]

Hi Paul,

I'm sending a fix for a bug I found on netboot and three little patches to
fix compilation warnings.

on netboot_path.patch i fixed the problem on netboot. According to pxe  
approach, after failing loading /etc/MACADDRESS, yaboot tries do  
retrieve /etc/IP. If it fails, we chop one digit from IP e try again.  
The bug was that we were chopping digits from fspec.file until the  
string was empty, and looking for "/etc/","/etc", "/et","/e" and "/"  
files before looking for default /etc/yaboot.conf. Now we stop in the  
last "/" found in fspec.file

Other minor patches:

exit_return.patch - we were calling exit instead of return 10 times in  
this file. weird thing... had it any purpose some time ago? It was  
causing compilation warnings.

include_string.patch - just put a new "#include string.h" in some files.

return_type.patch - fixed return type of the function  
cfg_set_default_by_mac. This is used on paulo's new patch for netfarm.

best regards,

Leo
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