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CC8D: Shorten dZ by one and try the same object again
Used by the routines at dZ_obj_hit_test and dZ_ride_dY.
Returns from the whole scan once nothing of dZ is left.
dZ_obj_shorten CC8D LD A,H shorter by a unit; none left, done
CC8E CALL shorten_delta
CC91 LD H,A
CC92 RET Z
CC93 JR dZ_obj_hit_test
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