Fix sort_ro get-keys function return wrong key number (#12522)
Before: ``` 127.0.0.1:6379> command getkeys sort_ro key (empty array) 127.0.0.1:6379> ``` After: ``` 127.0.0.1:6379> command getkeys sort_ro key 1) "key" 127.0.0.1:6379> ``` (cherry picked from commit b59f53ef)
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