[slf4j-dev] [qos-ch/slf4j] c6c7a9: fix SLF4J-469

[Ceki Gulcu]

  Branch: refs/heads/1.7-maintenance
  Home:   https://github.com/qos-ch/slf4j
  Commit: c6c7a98a7ee1e71382348ae3e41ff7818dfafd65
      https://github.com/qos-ch/slf4j/commit/c6c7a98a7ee1e71382348ae3e41ff7818dfafd65
  Author: Ceki Gulcu <ceki at qos.ch>
  Date:   2019-12-16 (Mon, 16 Dec 2019)

  Changed paths:
    M integration/build.xml
    A integration/src/test/java/org/slf4j/helpers/LoggerAccessingThread2.java
    A integration/src/test/java/org/slf4j/helpers/NoBindingMultithreadedInitializationTest2.java
    M slf4j-api/src/main/java/org/slf4j/LoggerFactory.java
    M slf4j-api/src/test/java/org/slf4j/helpers/MultithreadedInitializationTest.java

  Log Message:
  -----------
  fix SLF4J-469