The type of member ->irqs_sum is unsigned long, but kstat_cpu_irqs_sum()
returns int, which can result in truncation.  Therefore, change the
kstat_cpu_irqs_sum() function's return value to unsigned long to avoid
truncation.

Fixes: f2c66cd8 ("/proc/stat: scalability of irq num per cpu")
Reported-by: NElliott, Robert (Servers) <elliott@hpe.com>
Signed-off-by: NZhen Lei <thunder.leizhen@huawei.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Josh Don <joshdon@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: NFrederic Weisbecker <frederic@kernel.org>
Signed-off-by: NPaul E. McKenney <paulmck@kernel.org>