perf test: Fix spelling mistake "sythesizing" -> "synthesizing"

There are spelling mistakes in TEST_ASSERT_VAL messages. Fix them.

Signed-off-by: Colin Ian King <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/tests/mmap-thread-lookup.c

···
 static int test__mmap_thread_lookup(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 {
 	/* perf_event__synthesize_threads synthesize */
-	TEST_ASSERT_VAL("failed with sythesizing all",
+	TEST_ASSERT_VAL("failed with synthesizing all",
 			!mmap_events(synth_all));
 
 	/* perf_event__synthesize_thread_map synthesize */
-	TEST_ASSERT_VAL("failed with sythesizing process",
+	TEST_ASSERT_VAL("failed with synthesizing process",
 			!mmap_events(synth_process));
 
 	return 0;