[S390] signal: use set_restore_sigmask() helper
We should call set_restore_sigmask() instead of directly setting
TIF_RESTORE_SIGMASK. This change should have been done three years
earlier... see 4e4c22 "signals: add set_restore_sigmask".
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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