[Patch] Fix compiler warnings/errors in split-register-model.c

[Colin Law]

Attached is a patch to fix compiler warnings in
split-register-model.c.  In fact for me they prevent compilation,
possibly because I have specified --enable-compile-warnings.  I have
inspected the code and it appears that the warnings are unfounded, the
code appears to be safe, though I can see why the warnings were
generated.

I am using git svn and am not sure in what format the patch is
required.  I performed git diff to get this.  If I should do something
different please let me know.

Colin
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