rust/bwrap: log fusermount -u
errors to stderr
#5046
Merged
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I believe cosa is hitting an error in this code path, but we can't inspect the error because there's no journald running in supermin:
coreos/coreos-assembler#3848
We don't gain much by printing this error to the journal since it shouldn't be very common. Print it on stderr instead where it's more likely to have visibility.