remove duplicate fd lookup in aeProcessEvents (#3886)
remove duplicate fd lookup in aeProcessEvents (#3886)

Minor code cleanup.
ofirluzon/redis,PKRoma/redis,yossigo/redis,antirez/redis,yossigo/redis,charsyam/redis,soloestoy/redis,PKRoma/redis,soloestoy/redis,charsyam/redis,PKRoma/redis,yossigo/redis,oranagra/redis,charsyam/redis,soloestoy/redis,soloestoy/redis,antirez/redis,charsyam/redis,charsyam/redis,neomantra/redis,neomantra/redis,oranagra/redis,PKRoma/redis,yossigo/redis,ofirluzon/redis,oranagra/redis,oranagra/redis,neomantra/redis,ofirluzon/redis,ofirluzon/redis,soloestoy/redis,antirez/redis,PKRoma/redis,ofirluzon/redis,antirez/redis,neomantra/redis,oranagra/redis,neomantra/redis,yossigo/redis