From: Alexander Shatalin <[email protected]>

This patch improves the safety when restoring WRITES_STRICT by ensuring:
- The variable is not empty (`-n`)
- The target file is writable (`-w`)
Also improves formatting by quoting variables and following shell best
practices.

Signed-off-by: Alexander Shatalin <[email protected]>

Attachment: 0001-selftests-sysctl-improve-safety-and-formatting-for-W.patch
Description: Binary data

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