selftests/bpf: Fix typo in subtest_basic_usdt after merge conflict

Use proper 'called' variable name.

Fixes: ae28ed4 ("Merge tag 'bpf-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/aN0JVRynHxqKy4lw@krava/
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author: olsajiri

tools/testing/selftests/bpf/prog_tests/usdt.c

@@ -142,7 +142,7 @@ static void subtest_basic_usdt(bool optimized)
 		goto cleanup;
 #endif
 
-	alled = TRIGGER(1);
+	called = TRIGGER(1);
 
 	ASSERT_EQ(bss->usdt0_called, called, "usdt0_called");
 	ASSERT_EQ(bss->usdt3_called, called, "usdt3_called");