In journal_mount(), only set MNTK_SUJ flag after the jblocks are mapped. I believe there is a window otherwise where jblocks can be accessed without proper initialization.
In journal_mount(), only set MNTK_SUJ flag after the jblocks are mapped.
I believe there is a window otherwise where jblocks can be accessed
without proper initialization.

Reviewed by:	jeff
Tested by:	pho

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