fix zslGetRank bug in dead-code (#9246)
This fixes an issue with zslGetRank which will happen only if the
skiplist data stracture is added two entries with the same element name,
this can't happen in redis zsets (we use dict), but in theory this is a
bug in the underlaying skiplist code.
Fixes #3081 and #4032
Co-authored-by:
minjian.cai <cmjgithub@163.com>
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