generic/740: skip jffs2 as foreign fs earlier

Commit a633d252e3c4 ("shared/032: add options for jffs2") added a
check to skip checking the overwrite of jffs2, but only after
adding specific mkfs options for it and zeroing part of the device.

Switch to skipping it earlier in a more obvious place.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>
1 file changed