kernel/profile.c: simplify duplicated code in profile_setup()

The code to parse option string "schedule/sleep/kvm" of cmdline in
function profile_setup is redundant, so simplify that.

Link: https://lkml.kernel.org/r/20220901003121.53597-1-wuchi.zero@gmail.com


Signed-off-by: wuchi <wuchi.zero@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foudation.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>