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Pass zero as the TIOCSCTTY argument - #1717
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TIOCSCTTY takes an integer argument. Passing the address of zero supplies a
nonzero value instead. Pass a null pointer to encode zero and add a
regression test for the argument.
The regression test and isolated controlling-terminal tests pass with both
linux_raw and libc. strace confirms TIOCSCTTY receives zero. Both all-apis
suites retain two ARM prctl failures reproduced on the unpatched source.
Fixes #1703.