Fix writeCommandsDeniedByDiskError() inverted return value.
Fix writeCommandsDeniedByDiskError() inverted return value.

spinlock/redis,oranagra/redis,soveran/redis,charsyam/redis,yossigo/redis,yossigo/redis,PKRoma/redis,soloestoy/redis,soveran/redis,neomantra/redis,PKRoma/redis,GitHubMota/redis,spinlock/redis,charsyam/redis,PKRoma/redis,ofirluzon/redis,antirez/redis,antirez/redis,spinlock/redis,ctripcorp/redis,soloestoy/redis,oranagra/redis,nnog/redis,pmem/redis,soveran/redis,neomantra/redis,charsyam/redis,soloestoy/redis,neomantra/redis,ofirluzon/redis,pmem/redis,ctripcorp/redis,nnog/redis,soloestoy/redis,yossigo/redis,spinlock/redis,oranagra/redis,antirez/redis,ctripcorp/redis,oranagra/redis,antirez/redis,pmem/redis,oranagra/redis,neomantra/redis,yossigo/redis,nnog/redis,GitHubMota/redis,ofirluzon/redis,nnog/redis,ofirluzon/redis,PKRoma/redis,neomantra/redis,charsyam/redis,pmem/redis,GitHubMota/redis,GitHubMota/redis,soloestoy/redis,soveran/redis,ofirluzon/redis,yossigo/redis,ctripcorp/redis,PKRoma/redis,charsyam/redis