staging: vchiq: Have vchiq_dump_* functions return an error code
These functions currently modify the struct dump_context passed to them, and set context->actual to -EFAULT in case of error. The issue is that this is never returned to the user (except accidentally when things align so that that happens). So, have these functions return 0 on success and the appropriate error code otherwise, and return nonzero errors to the user. Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Marcelo Diop-Gonzalez <marcgonzalez@google.com> Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Link: https://lore.kernel.org/r/20191120202102.249121-5-marcgonzalez@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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