Fix inverse contidion in open tunnel retain check

[fvacek]

No description provided.

[github-actions]

Code coverage report for 1c868d6

Coverage difference

❌ Code coverage worsened.

Filename	Stmts	Miss	Cover	Missing
src/lib.rs	+2	+2	+100.00%	674, 675, 676
TOTAL	+2	+2	+100.00%

Overall coverage

Click to expand

Filename	Stmts	Miss	Cover	Missing
src/lib.rs	514	514	0.00%	101-817
src/serial.rs	22	22	0.00%	10-39
src/bin/shvcall.rs	24	24	0.00%	9-38
TOTAL	560	560	0.00%

HTML reports

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(cd "$(mktemp -d)" && gh run -R silicon-heaven/shvcall-rs download -n shvcall-cov-html-1c868d61c84ba79652ac5c2038ddf93a7dc1f016 && ls -1 | xargs -n1 xdg-open)

You can download the HTML reports manually here.