Modules hooks: fix memory leak in example module.
Modules hooks: fix memory leak in example module.

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