signal/all/do_sigreturn - remove __get_user checks
Remove "if(__get_user" checks and their related error paths for all architecture's do_sigreturn. Remove the unlock_user_struct when the only way to end up there is from failed lock_user_struct. v3: remove unneccesary sigsegv label as suggested by Peter Signed-off-by: NRiku Voipio <riku.voipio@linaro.org> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
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