perf cgroup: Convert cgroup_sel.refcnt from atomic_t to refcount_t

The refcount_t type and corresponding API should be used instead of
atomic_t when the variable is used as a reference counter.

This allows to avoid accidental refcounter overflows that might lead to
use-after-free situations.

Signed-off-by: Elena Reshetova <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Kook <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: [email protected]
Cc: Andrew Morton <[email protected]>
Cc: David Windsor <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Hans Liljestrand <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kees Kook <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Matija Glavinic Pecotic <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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