sched, sh: Fold finish_arch_switch() into switch_to()

The code looks buggy; why would we be restoring the previous task's
DSP state after we've switched to the next task?

Fix that and put the restore in switch_to(), removing the need for
finish_arch_switch().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: michael@amarulasolutions.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/sh/include/asm/switch_to_32.h

@@ -78,6 +78,8 @@ do {								\
 								\
 	if (is_dsp_enabled(prev))				\
 		__save_dsp(prev);				\
+	if (is_dsp_enabled(next))				\
+		__restore_dsp(next);				\
 								\
 	__ts1 = (u32 *)&prev->thread.sp;			\
 	__ts2 = (u32 *)&prev->thread.pc;			\
@@ -125,10 +127,4 @@ do {								\
 	last = __last;						\
 } while (0)
 
-#define finish_arch_switch(prev)				\
-do {								\
-	if (is_dsp_enabled(prev))				\
-		__restore_dsp(prev);				\
-} while (0)
-
 #endif /* __ASM_SH_SWITCH_TO_32_H */