nios2: restarts apply only to the first sigframe we build...

stable inclusion
from stable-v5.10.138
commit 600ff4b13b0ecb94e7ba21531c7386074cca56ea
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60QFD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=600ff4b13b0ecb94e7ba21531c7386074cca56ea



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commit 411a76b7 upstream.

Fixes: b53e906d ("nios2: Signal handling support")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>