ARC: ptrace: fix typo in genregs_get

Fix typo in genregs_get that makes it store field address
instead of its value.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>

Author: Sergey Matyukevich

arch/arc/kernel/ptrace.c

@@ -187,7 +187,7 @@ static int genregs_get(struct task_struct *target,
 	membuf_store(&to, cregs->r15);
 	membuf_store(&to, cregs->r14);
 #ifdef CONFIG_ISA_ARCV3
-	membuf_store(&to, &ptregs->r13);
+	membuf_store(&to, ptregs->r13);
 #else
 	membuf_store(&to, cregs->r13);
 #endif