use getPositiveLongFromObjectOrReply for positive check in spop (#8146)
use getPositiveLongFromObjectOrReply for positive check in spop (#8146)

This is a cleanup commit that doesn't fix any bug, however it does change the error response text in case the user provided a negative number.
JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis