Btrfs: Remove the check for old-style mkfs

This was used to make sure that a fresh btrfs from an older mkfs.btrfs,
but it also allows us to mount a buggy btrfs if this btrfs has the right
superblock head part but has something wrong with chunk tree part[1], and
after that we can hit BUG_ON()s set in the code to prevent something
impossible.

Since David has released "Btrfs progs v3.19-rc2", just remove the check,
if anyone who wants to make a fresh btrfs, please use the latest one.

[1]: http://www.spinics.net/lists/linux-btrfs/msg42358.html

Signed-off-by: Liu Bo <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: Chris Mason <[email protected]>

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