partial revert nullable type for curl_multi_getcontent

[kkmuffme]

Fix #8351

Partially reverts f28ac73

[kkmuffme]

How can the tests be fixed here? Since the reflection disagrees with the map?

[orklah]

Can you put count back in ignoredFunctions with a comment explaining why? Please also add a test so we can make sure this change won't be reverted without a fix in the future

[kkmuffme]

@orklah I think you are talking about a different issue? (perhaps #8346?)

No "count" here :-) ready to merge (no extra test for this, as this is a specialty case)

[AndrolGenhald]

It looks like curl_multi_getcontent probably needs to go in InternalCallMapHandlerTest::$ignoredFunctions to fix the failing test.

[kkmuffme]

Added it to InternalCallMapHandlerTest::$ignoredReturnTypeOnlyFunctions now.
No test added, since it's in the ignored list anyway, so a test wouldn't be super useful (and a waste of my time, as this is a super niche issue)

Ready to be merged

[orklah]

Thanks!