Fix missing assignment/uninitialized value

[niklas88]

The test checked for _langPredLower/UpperBound being zero but did never
correctly set them. Thus the stack value for res was indeed
uninitalized. Only found this because valgrind seems to be better on
s390x.

[niklas88]

Also I've seen this leading to an actual test failure on s390x and verified that this change fixes that as well.

[lehmann-4178656ch]

LGTM, but out of curiosity, why are the

{
 VocabularyMerger m;
 [res = ]m.mergeVocabulary(...);
}

always in a different scope then the rest of the test? I don't see that they are performed multiple times in the same test - or am I missing something obvious?

[niklas88]

LGTM, but out of curiosity, why are the

{
 VocabularyMerger m;
 [res = ]m.mergeVocabulary(...);
}

always in a different scope then the rest of the test? I don't see that they are performed multiple times in the same test - or am I missing something obvious?

No idea, I guess that's to test that anything freed by the merger doesn't break access.