sched: mark print_cfs_stats static

sched_fair.c defines print_cfs_stats, and sched_debug.c uses it, but sched.c
includes both sched_fair.c and sched_debug.c, so all the references to
print_cfs_stats occur in the same compilation unit.  Thus, mark
print_cfs_stats static.

Eliminates a sparse warning:
warning: symbol 'print_cfs_stats' was not declared. Should it be static?
Signed-off-by: Josh Triplett <josh@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/sched_fair.c

@@ -1107,7 +1107,7 @@ struct sched_class fair_sched_class __read_mostly = {
 };
 
 #ifdef CONFIG_SCHED_DEBUG
-void print_cfs_stats(struct seq_file *m, int cpu, u64 now)
+static void print_cfs_stats(struct seq_file *m, int cpu, u64 now)
 {
 	struct rq *rq = cpu_rq(cpu);
 	struct cfs_rq *cfs_rq;