csky: Fix a size determination in gpr_get()

stable inclusion
from stable-5.10.20
commit 02309dd337374e110909de81cfe463c7b82c2e2d
bugzilla: 50608

--------------------------------

[ Upstream commit 8bfb6764 ]

"*" is missed  in size determination as we are passing register set
rather than a pointer.

Fixes: dcad7854 ("sky: switch to ->regset_get()")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@gmail.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>