Dotty

Fix warning message for matching on redundant nulls #32971

Job	Run time
community_build_a	52m 57s
community_build_b	1h 24m 4s
community_build_c	1h 0m 42s
MiMa	11m 15s
test	30m 30s
test_non_bootstrapped	0s
test_sbt	18m 42s
test_scala2_library_tasty	0s
test_windows_fast	32m 5s
test_windows_full	0s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 58s
test-msi-package	0s
build-chocolatey-package / build	21s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	4h 58m 34s

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