locking/lockdep: Add a comment about crossrelease_hist_end() in lockdep_sys_exit()

In lockdep_sys_exit(), crossrelease_hist_end() is called unconditionally
even when getting here without having started e.g. just after forking.

But it's no problem since it would roll back to an invalid entry anyway.
Add a comment to explain this.

Signed-off-by: Byungchul Park <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
[ Improved the description and the comments. ]
Signed-off-by: Ingo Molnar <[email protected]>

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