klist: implement klist_prev()
klist_prev() gets the previous element in the list. It is useful to traverse through the list in reverse order, for example, to provide LIFO (last in first out) variant of access. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NLee Jones <lee.jones@linaro.org>
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