#259 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 "malloc" in functions like "get_address" and "do_muf_topprofs"?
http://fbmuck.cvs.sourceforge.net/fbmuck/fbmuck/src/compile.c?revision=1.88&view=markup
http://fbmuck.cvs.sourceforge.net/fbmuck/fbmuck/src/wiz.c?revision=1.38&view=markup