mlang: fix memory leaks in error path (found by Smatch) [fixed]

[Lionel_Debroux]

ConvertINetString leaks some heap memory in an error path. Found in
Michael Stefaniuc's list of Wine potential bugs detected by Smatch.

This new version of the patch gets rid of the goto I added and writes 
the code the way Dmitry Timoshkov suggested.

2007-09-24  Lionel Debroux <lionel_debroux at yahoo.fr>
        * dlls/mlang/mlang.c:
        mlang: fix memory leaks in error path (found by Smatch).


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