fix: dev: Fix uninitialized pointer check on getipandkeylist

Function `named_config_getipandkeylist` could, in case of error in the early code attempting to get the `port` or `tls-port`, make a pointer check on a non-initialized value. This is now fixed.

Merge branch 'colin/getipandkeylist-uinitstate' into 'main'

See merge request isc-projects/bind9!11303