#31 Check return codes everywhere

erroneous behavior
open
nobody
None
5
2008-03-19
2008-03-19
Markus Elfring
No

Some checks for return codes are missing.

Would you like to add more error handling for return values like at the following places?
- file.c - id3_file_fdopen:
(f)close
dup2

- madplay.c - show_usage:
fprintf

- relocatable.c - DllMain:
strdup

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