powerpc: Use the newly added is_tsk_32bit_task() macro

Two places deserve using the macro is_tsk_32bit_task() added by
commit 25274524 ("powerpc/audit: Fix syscall_get_arch()")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7304a889dbe885aefad8a8333673c81ee4b8f7a6.1642751874.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/ptrace/ptrace-view.c

@@ -841,7 +841,7 @@ static const struct user_regset_view user_ppc_compat_view = {
 
 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 {
-	if (IS_ENABLED(CONFIG_PPC64) && test_tsk_thread_flag(task, TIF_32BIT))
+	if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task))
 		return &user_ppc_compat_view;
 	return &user_ppc_native_view;
 }

arch/powerpc/perf/perf_regs.c

@@ -134,12 +134,10 @@ int perf_reg_validate(u64 mask)
 
 u64 perf_reg_abi(struct task_struct *task)
 {
-#ifdef CONFIG_PPC64
-	if (!test_tsk_thread_flag(task, TIF_32BIT))
-		return PERF_SAMPLE_REGS_ABI_64;
+	if (is_tsk_32bit_task(task))
+		return PERF_SAMPLE_REGS_ABI_32;
 	else
-#endif
-	return PERF_SAMPLE_REGS_ABI_32;
+		return PERF_SAMPLE_REGS_ABI_64;
 }
 
 void perf_get_regs_user(struct perf_regs *regs_user,