mount: print a helpful error message

Just returning a failure exit status makes it hard to tell what the
actual issue was. Instead, the mount command now also provides some
textual output.

See https://github.com/koverstreet/bcachefs-tools/issues/308 for an
example where mount does not provide any helpful output, even with
BCACHEFS_LOG=trace enabled.

Signed-off-by: Florian Schmaus <flo@geekplace.eu>

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