wifi: wilc1000: Use min() to improve code

Use min() to reduce the code and improve its readability.

Reviewed-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Link: https://patch.msgid.link/20250715121721.266713-7-rongqianfeng@vivo.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>