TOMOYO: Compare filesystem by magic number rather than by name.

Please apply below one after merging 1557d330
(Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6

).
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[PATCH for 2.6.33] TOMOYO: Compare filesystem by magic number rather than by name.

We can use magic number for checking whether the filesystem is procfs or not.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>