Let the kmemdup_array() take care about multiplication
and possible overflows.

Using kmemdup_array() is more appropriate and makes the code
easier to audit.
Signed-off-by: Shen Lichuan <shenlichuan@vivo.com>
Link: https://patch.msgid.link/20240826054402.58396-1-shenlichuan@vivo.comSigned-off-by: Mark Brown <broonie@kernel.org>