Add missing continue: we can't proceed further if the
kernel does not panic with zfs_panic_recover.

Illumos issue:
    5438 zfs_blkptr_verify should continue after zfs_panic_recover

Reported by:	Coverity
CID:		1232014


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275923 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f