Correct gcc warnings for function return type, printf argument
types, and signed/unsigned compare.

Cross-compiled with no warnings/errors for alpha, ia64,
ppc32, ppc64, sparc32, sparc64, x86_64, and native on i386.
(-W -Wall)

[pre-built tool chains are available from:
http://developer.osdl.org/dev/plm/cross_compile/ ]
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>