mount: Don't pass a NULL format string to xo_err().
This fixes a -Wformat error from GCC 9.
Fixes: e725ee7eb672 mount: add libxo(3) support
(cherry picked from commit 9d324b5ffc8a783ceff2a78dea19602a1d8f045a)
mount: Don't pass a NULL format string to xo_err(). Tags None Referenced Files None Subscribers None
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