sparc: Replace test_ti_thread_flag() with test_tsk_thread_flag()

Use test_tsk_thread_flag() directly instead of test_ti_thread_flag() to
improve readability when the argument type is struct task_struct, it is
similar with commit 5afc7855 ("arm64: Use test_tsk_thread_flag() for
checking TIF_SINGLESTEP").
Signed-off-by: NTiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/process_32.c

@@ -184,7 +184,7 @@ void exit_thread(struct task_struct *tsk)
 #ifndef CONFIG_SMP
 	if (last_task_used_math == tsk) {
 #else
-	if (test_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU)) {
+	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
 #endif
 		/* Keep process from leaving FPU in a bogon state. */
 		put_psr(get_psr() | PSR_EF);