sched_ext: Swap argument positions in kcalloc() call to avoid compiler warning

sched_ext: Swap argument positions in kcalloc() call to avoid compiler warning

alloc_exit_info() calls kcalloc() but puts in the size of the element as the
first argument which triggers the following gcc warning:

  kernel/sched/ext.c:3815:32: warning: ‘kmalloc_array_noprof’ sizes
  specified with ‘sizeof’ in the earlier argument and not in the later
  argument [-Wcalloc-transposed-args]

Fix it by swapping the positions of the first two arguments. No functional
changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Vishal Chourasia <vishalc@linux.ibm.com>
Link: http://lkml.kernel.org/r/ZoG6zreEtQhAUr_2@linux.ibm.com