Fix rdbSaveKeyValuePair() integer overflow.
Fix rdbSaveKeyValuePair() integer overflow.

Again thanks to @oranagra. The object idle time does not fit into an int
sometimes: use the native type that the serialization function will get
as argument, which is uint64_t.

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