imlib: Fix quad_segment_maxima memory leak.
imlib: Fix quad_segment_maxima memory leak.

Memory forgot to free when nmaxima is least 4 maxima.
iabdalkader/openmv,openmv/openmv,kwagyeman/openmv,openmv/openmv,kwagyeman/openmv,openmv/openmv,kwagyeman/openmv,kwagyeman/openmv,openmv/openmv,iabdalkader/openmv,iabdalkader/openmv,iabdalkader/openmv