lib/percpu_counter: add missing __percpu qualifier to a cast

lib/percpu_counter: add missing __percpu qualifier to a cast

Add missing __percpu qualifier to a (void *) cast to fix

percpu_counter.c:212:36: warning: cast removes address space '__percpu' of expression
percpu_counter.c:212:33: warning: incorrect type in assignment (different address spaces)
percpu_counter.c:212:33:    expected signed int [noderef] [usertype] __percpu *counters
percpu_counter.c:212:33:    got void *

sparse warnings.

Found by GCC's named address space checks.

There were no changes in the resulting object file.

Link: https://lkml.kernel.org/r/20240814064437.940162-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>