"[PATCH] NUC900: patch for implement clk_get_rate"
https://lkml.org/lkml/2010/6/15/147

This patch would have fixed the apbfreq not being a real struct member
and would also explain why clk_get_rate is called without using it's
return value in the line above what you have.

From 2010, so it got dropped somewhere and ignored/abandoned