perf tests: Fix memory leak by expr__find_other() in test__expr()

  =================================================================
  ==7506==ERROR: LeakSanitizer: detected memory leaks

  Direct leak of 13 byte(s) in 3 object(s) allocated from:
      #0 0x7f03339d6070 in __interceptor_strdup (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x3b070)
      beagleboard#1 0x5625e53aaef0 in expr__find_other util/expr.y:221
      beagleboard#2 0x5625e51bcd3f in test__expr tests/expr.c:52
      beagleboard#3 0x5625e51528e6 in run_test tests/builtin-test.c:358
      beagleboard#4 0x5625e5152baf in test_and_print tests/builtin-test.c:388
      beagleboard#5 0x5625e51543fe in __cmd_test tests/builtin-test.c:583
      beagleboard#6 0x5625e515572f in cmd_test tests/builtin-test.c:722
      beagleboard#7 0x5625e51c3fb8 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
      beagleboard#8 0x5625e51c44f7 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
      beagleboard#9 0x5625e51c48fb in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
      beagleboard#10 0x5625e51c5069 in main /home/changbin/work/linux/tools/perf/perf.c:520
      beagleboard#11 0x7f033214d09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

Signed-off-by: Changbin Du <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt (VMware) <[email protected]>
Fixes: 0751673 ("perf tools: Add a simple expression parser for JSON")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/tests/expr.c

@@ -19,7 +19,7 @@ int test__expr(struct test *t __maybe_unused, int subtest __maybe_unused)
 	const char *p;
 	const char **other;
 	double val;
-	int ret;
+	int i, ret;
 	struct parse_ctx ctx;
 	int num_other;
 
@@ -56,6 +56,9 @@ int test__expr(struct test *t __maybe_unused, int subtest __maybe_unused)
 	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++)
+		free((void *)other[i]);
 	free((void *)other);
 
 	return 0;