rcutorture: Print negatives for SRCU counter wraparound
The srcu_torture_stats() function prints SRCU's per-CPU c[] array with an unsigned format, which means that the number one less than zero is a very large number. This commit therefore prints this array with a signed format in order to improve readability of the rcutorture output. Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org>
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