[Blackfin] arch: fix bug - breaking the atomic sections code.

The following cleanup patch:
  add __user markings to a few userspace system functions

mysteriously added a "&" operator that doesn't belong in there, breaking the
atomic sections code.
Signed-off-by: NBernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: NBryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/process.c

@@ -245,7 +245,7 @@ unsigned long get_wchan(struct task_struct *p)
 
 void finish_atomic_sections (struct pt_regs *regs)
 {
-	int __user *up0 = (int __user *)&regs->p0;
+	int __user *up0 = (int __user *)regs->p0;
 
 	if (regs->pc < ATOMIC_SEQS_START || regs->pc >= ATOMIC_SEQS_END)
 		return;