samples/logging: Make logging sample 'main' return int
POSIX main is supposed to return int, and there's no reason not to have
this example do that.
Signed-off-by: 
Keith Packard <keithp@keithp.com>
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POSIX main is supposed to return int, and there's no reason not to have
this example do that.
Signed-off-by: Keith Packard <keithp@keithp.com>