Remove stack trace from the field trial mismatch message.

slf4j-api/src/main/java/org/slf4j/LoggerFactory.java

@@ -305,13 +305,12 @@ public static Logger getLogger(@Nonnull Class<?> clazz) {
     if (AUTO_NAMED_LOGGER_FIELD_TRIAL) {
       String autoName = Util.getCallingClassName();
       if (!logger.getName().equals(autoName)) {
-        IllegalStateException exception = new IllegalStateException(String.format(
+        Util.report(String.format(
             "Auto-named logger field trial: mismatch detected between " +
             "given logger name and automatic logger name. Given name: \"%s\"; " +
             "automatic name: \"%s\". If this is unexpected, please file a bug " +
             "against slf4j. Set property %s to \"false\" to disable this check.",
             logger.getName(), autoName, AUTO_NAMED_LOGGER_FIELD_TRIAL_PROPERTY));
-        exception.printStackTrace(System.err);
       }
     }
     return logger;