[Suggestion] kernel/rcutorture.c: about using scnprintf() insteadof sprintf().

[Chen Gang]

Hello Maintainers:

In srcu_torture_stats(), if cpus are more than 1K, the PAGE_SIZE will
not be enough.

In rcu_torture_printk(), the 'page' maximized size is 4096, it has a
function pointer for printing, which not tell its maximized length.


Welcome any additional suggestions or completions.


Thanks.
-- 
Chen Gang
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