sh: Add ftrace syscall tracing support

Now that I've added TIF_SYSCALL_FTRACE the thread flags do not fit into
a single byte any more. Code testing them now needs to be aware of the
upper and lower bytes.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/syscall_32.h

@@ -65,6 +65,7 @@ static inline void syscall_get_arguments(struct task_struct *task,
 	case 3: args[2] = regs->regs[6];
 	case 2: args[1] = regs->regs[5];
 	case 1:	args[0] = regs->regs[4];
+	case 0:
 		break;
 	default:
 		BUG();