Jim Meyering 4d4d8bccc3 tests: use "returns_" rather than explicit comparison with "$?" ...

The previous "returns_"-using change failed to convert many
uses of "$?".  Convert all but two of the remaining ones.
* tests/ls/stat-vs-dirent.sh: Likewise.
* tests/misc/head-write-error.sh: Likewise.
* tests/misc/nice.sh: Likewise.
* tests/misc/nohup.sh: Likewise.
* tests/misc/stdbuf.sh: Likewise.
* tests/misc/sync.sh: Likewise.
* tests/tail-2/pid.sh: Likewise.
* tests/tail-2/wait.sh: Likewise.
Thanks to Bernhard Volker for spotting this.

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..

abmon-align.sh

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block-size.sh

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capability.sh

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color-clear-to-eol.sh

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color-dtype-dir.sh

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color-norm.sh

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color-term.sh

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dangle.sh

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dired.sh

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file-type.sh

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follow-slink.sh

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getxattr-speedup.sh

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hex-option.sh

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infloop.sh

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inode.sh

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m-option.sh

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multihardlink.sh

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nameless-uid.sh

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no-arg.sh

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no-cap.sh

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proc-selinux-segfault.sh

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readdir-mountpoint-inode.sh

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recursive.sh

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root-rel-symlink-color.sh

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rt-1.sh

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slink-acl.sh

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stat-dtype.sh

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stat-failed.sh

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stat-free-color.sh

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stat-free-symlinks.sh

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stat-vs-dirent.sh

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symlink-slash.sh

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time-style-diag.sh

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w-option.sh

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x-option.sh

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