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.
charsyam/redis,ofirluzon/redis,charsyam/redis,yossigo/redis,ctripcorp/redis,neomantra/redis,antirez/redis,PKRoma/redis,ofirluzon/redis,neomantra/redis,ofirluzon/redis,PKRoma/redis,oranagra/redis,antirez/redis,charsyam/redis,ofirluzon/redis,soloestoy/redis,yossigo/redis,neomantra/redis,ctripcorp/redis,neomantra/redis,PKRoma/redis,oranagra/redis,oranagra/redis,charsyam/redis,soloestoy/redis,yossigo/redis,antirez/redis,charsyam/redis,antirez/redis,soloestoy/redis,oranagra/redis,neomantra/redis,PKRoma/redis,ofirluzon/redis,yossigo/redis,ctripcorp/redis,ctripcorp/redis,soloestoy/redis,soloestoy/redis,yossigo/redis,oranagra/redis,PKRoma/redis