[Blackfin] arch: add missing __user marking to ss_sp member of signalstack and a few userspace system functions

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/traps.c

@@ -506,7 +506,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
 
 	info.si_signo = sig;
 	info.si_errno = 0;
-	info.si_addr = (void *)fp->pc;
+	info.si_addr = (void __user *)fp->pc;
 	force_sig_info(sig, &info, current);
 
 	trace_buffer_restore(j);