lib: Fix examples not working

Remove the sanity check added in commit b1afa9da, having a poll setup
isn't necessary to use timeouts, as long as only sync functions are
used.

Closes: #139
2 jobs from master in 3 minutes and 16 seconds (queued for 1 second)
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passed #70620
build

00:02:20

 
  Test
passed #70621
flatpak master

00:00:55