pstore/ram: Factor ramoops_get_next_prz() out of ramoops_pstore_read()
This will help make code clearer when we'll add support for other message types. The patch also changes return value from -EINVAL to 0 in case of end-of-records. The exact value doesn't matter for pstore (it should be just <= 0), but 0 feels more correct. Signed-off-by: NAnton Vorontsov <anton.vorontsov@linaro.org> Acked-by: NKees Cook <keescook@chromium.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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