Octave: fix bugs in output of cleanup code

Closes #35

CHANGES.current

@@ -8,6 +8,12 @@ Version 2.0.10 (in progress)
 2013-04-17: wsfulton
             [C#] Pull patch #34 from BrantKyser to fix smart pointers in conjuction with directors.
 
+2013-04-15: kwwette
+            [Octave] Fix bugs in output of cleanup code.
+            - Cleanup code is now written also after the "fail:" label, so it will be called if
+              a SWIG_exception is raised by the wrapping function, consistent with other modules.
+            - Octave module now also recognises the "$cleanup" special variable, if needed.
+
 2013-04-08: kwwette
             Add -MP option to SWIG for generating phony targets for all dependencies.
             - Prevents make from complaining if header files have been deleted before

Source/Modules/octave.cxx

@@ -744,10 +744,15 @@ public:
       Delete(tm);
     }
 
-    Printf(f->code, "fail:\n");	// we should free locals etc if this happens
     Printf(f->code, "return _out;\n");
+    Printf(f->code, "fail:\n");	// we should free locals etc if this happens
+    Printv(f->code, cleanup, NIL);
+    Printf(f->code, "return octave_value_list();\n");
     Printf(f->code, "}\n");
 
+    /* Substitute the cleanup code */
+    Replaceall(f->code, "$cleanup", cleanup);
+
     Replaceall(f->code, "$symname", iname);
     Wrapper_print(f, f_wrappers);
     DelWrapper(f);