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MFC r317912: sh: Fix INTOFF leak after a builtin with different locale

Description

MFC r317912: sh: Fix INTOFF leak after a builtin with different locale
settings.

After executing a builtin with different locale settings such as

LC_ALL=C true

SIGINT handling was left disabled indefinitely.

Details

Provenance
jillesAuthored on
Parents
rS318278: Mark errf _Noreturn, and mark errf and warn __printflike
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