mvc/model/manager.c: fix warnings produced by scan-build
mvc/model/manager.c: fix warnings produced by scan-build

unisys12/phalcon-hhvm,unisys12/phalcon-hhvm,Zaszczyk/cphalcon,Zaszczyk/cphalcon,Zaszczyk/cphalcon,Zaszczyk/cphalcon,unisys12/phalcon-hhvm,unisys12/phalcon-hhvm,unisys12/phalcon-hhvm,unisys12/phalcon-hhvm