greybus: protocol: switch gb_protocol_register() to return an int
We will want to return this value as a return value for module_init() and bool does not play well with module_init(). So make it a "real" error value and return int and fix up all callers of the function. Reviewed-by: NAlex Elder <elder@linaro.org> Signed-off-by: NGreg Kroah-Hartman <greg@kroah.com>
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