[warning-fix][-Wreturn-type]

src/clstepcore/STEPattributeList.cc

@@ -47,6 +47,8 @@ STEPattribute & STEPattributeList::operator []( int n ) {
     // else
     cerr << "\nERROR in STEP Core library:  " << __FILE__ <<  ":"
          << __LINE__ << "\n" << _POC_ << "\n\n";
+    abort();
+    return *(STEPattribute*) 0;  //will never get here, but gcc produces warning
 }
 
 int STEPattributeList::list_length() {

src/express/object.c

@@ -30,9 +30,7 @@ Symbol *
 UNK_get_symbol( Generic x ) {
     fprintf( stderr, "OBJget_symbol called on object of unknown type\n" );
     ERRORabort( 0 );
-#if defined(lint) || defined(CENTERLINE)
     return 0;
-#endif
 }
 
 /*