Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/tests/expr.c b/tools/perf/tests/expr.c
index 01f0706..87843af 100644
--- a/tools/perf/tests/expr.c
+++ b/tools/perf/tests/expr.c
@@ -3,6 +3,8 @@
 #include "util/expr.h"
 #include "tests.h"
 #include <stdlib.h>
+#include <string.h>
+#include <linux/zalloc.h>
 
 static int test(struct parse_ctx *ctx, const char *e, double val2)
 {
@@ -19,7 +21,7 @@
 	const char *p;
 	const char **other;
 	double val;
-	int ret;
+	int i, ret;
 	struct parse_ctx ctx;
 	int num_other;
 
@@ -56,6 +58,9 @@
 	TEST_ASSERT_VAL("find other", !strcmp(other[1], "BAZ"));
 	TEST_ASSERT_VAL("find other", !strcmp(other[2], "BOZO"));
 	TEST_ASSERT_VAL("find other", other[3] == NULL);
+
+	for (i = 0; i < num_other; i++)
+		zfree(&other[i]);
 	free((void *)other);
 
 	return 0;