kexec tools gcc warnings cleanup

[Mohan Kumar M]

Cleanup the warnings generated in GCC 4.1.0 compilation of kexec-tools.

This patch is created on top of the following level of
kexec-tools:

- kexec-tools-1.101.tar.gz (from eric biederman's site or 
from lse site)
- kexec-tools-1.101-kdump6.patch (consolidated patch posted
on
http://lse.sourceforge.net/kdump/patches/1.101-kdump6/kexec-tools-1.101-kdump6.patch)

Review and suggestions are welcome.

Note:
Resending the patch since its not delivered to both fastboot and
linuxppc64-dev mailing list.

Regards,
Mohan.
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