#19 Check return codes everywhere

[Markus Elfring]

Some checks for return codes are missing.

Examples:
Would you like to add more error handling for return values from "fprintf" like in the function "handle_DeviceType" and from "close" in the function "gdam_server_destroy"?
http://gdam.cvs.sourceforge.net/gdam/gdam/server/gdamconfigfile.c?revision=1.23&view=markup
http://gdam.cvs.sourceforge.net/gdam/gdam/server/gdamserver.c?revision=1.13&view=markup