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loader: zfs_fmtdev can crash when pool discovery did fail and we have no spa

Description

loader: zfs_fmtdev can crash when pool discovery did fail and we have no spa

When zfs probe did fail and no spa was created, but zfs_fmtdev() is called,
we will crash while dereferencing spa (NULL pointer dereference).

MFC after: 1 week

Details

Provenance
tsoomeAuthored on
Parents
rS353756: MFC r353343: zfs: remove gratuitous divergence from other openzfs flavours
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