Blackfin: fix typo in ptrace poking

Commit c014e15a (Blackfin: convert ptrace to new memory functions)
introduced a copy & paste typo in the ptrace poke data/text handling.  The
access_process_vm() function call was telling it to read instead of write.
Signed-off-by: NJie Zhang <jie.zhang@analog.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

arch/blackfin/kernel/ptrace.c

@@ -315,7 +315,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			case BFIN_MEM_ACCESS_CORE:
 			case BFIN_MEM_ACCESS_CORE_ONLY:
 				copied = access_process_vm(child, addr, &data,
-				                           to_copy, 0);
+				                           to_copy, 1);
 				if (copied)
 					break;