[camel-imapx-conn-manager.c] Correct return values in some functions
[camel-imapx-conn-manager.c] Correct return values in some functions

tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server