perf test: Fix spelling mistake "leadking" -> "leaking"

There are a couple of spelling mistakes in test assert messages. Fix them.
Signed-off-by: NColin King <colin.king@canonical.com>
Reviewed-by: NMukesh Ojha <mojha@codeaurora.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/20190417105539.5902-1-colin.king@canonical.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/dso-data.c

@@ -304,7 +304,7 @@ int test__dso_data_cache(struct test *test __maybe_unused, int subtest __maybe_u
 	/* Make sure we did not leak any file descriptor. */
 	nr_end = open_files_cnt();
 	pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
-	TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
+	TEST_ASSERT_VAL("failed leaking files", nr == nr_end);
 	return 0;
 }
 
@@ -380,6 +380,6 @@ int test__dso_data_reopen(struct test *test __maybe_unused, int subtest __maybe_
 	/* Make sure we did not leak any file descriptor. */
 	nr_end = open_files_cnt();
 	pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
-	TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
+	TEST_ASSERT_VAL("failed leaking files", nr == nr_end);
 	return 0;
 }