[Toybox] [PATCH] losetup.test: bail out if loopback devices are already in use.

[enh]

There's probably a way to filter out the existing ones, but it's likely
to be pretty painful and isn't immediately necessary.

(I hit this case on Android cloud x86 devices.)
---
 tests/losetup.test | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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