Subtracting one dungeon depth value from another had the subtraction
backwards and that yielded a negative value where a positive one is
expected. If NH_RELEASE_STATUS were to be set to NH_STATUS_RELEASED
then this was at risk of crashing (if the bad subtraction yields -2,
rn2(diff+2) would divide by 0) since rn2()'s argument isn't validated
for released version.
fixes37.0 was confused, listing a couple of things that aren't bugs
in 3.6 as general fixes. I suspect that the DLB one was fixed before
being exposed via git, so shouldn't be there at all.
e0c67f49fc