Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/testing/selftests/proc/proc-self-wchan.c b/tools/testing/selftests/proc/proc-self-wchan.c
index a38b2fb..b467b98 100644
--- a/tools/testing/selftests/proc/proc-self-wchan.c
+++ b/tools/testing/selftests/proc/proc-self-wchan.c
@@ -27,7 +27,7 @@
 	fd = open("/proc/self/wchan", O_RDONLY);
 	if (fd == -1) {
 		if (errno == ENOENT)
-			return 2;
+			return 4;
 		return 1;
 	}