selftests/sched_ext: Remove duplicate sched.h header

./tools/testing/selftests/sched_ext/hotplug.c: sched.h is included more than once.

Reported-by: Abaci Robot <[email protected]>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=22941
Signed-off-by: Jiapeng Chong <[email protected]>
Acked-by: Andrea Righi <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>

Author: wb-zjp846396

tools/testing/selftests/sched_ext/hotplug.c

@@ -6,7 +6,6 @@
 #include <bpf/bpf.h>
 #include <sched.h>
 #include <scx/common.h>
-#include <sched.h>
 #include <sys/wait.h>
 #include <unistd.h>