Fix wrong function name. The convention in these files is that names of
extraction functions should reflect bit patterns they are extracting.

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Reviewed-by: Stefan Markovic <smarkovic@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>