kho: remove unnecessary WARN_ON(err) in kho_populate()

kho: remove unnecessary WARN_ON(err) in kho_populate()

The following pr_warn() provides detailed error and location information,
WARN_ON(err) adds no additional debugging value, so remove the redundant
WARN_ON() call.

Link: https://lkml.kernel.org/r/20260212111146.210086-3-ranxiaokai627@163.com
Signed-off-by: Ran Xiaokai <ran.xiaokai@zte.com.cn>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>