Variable 'ps' is set to wdev->ps but this value is never read as it is
overwritten with a new value later on, hence it is a redundant
assignment and can be removed.

Cleans up the following clang-analyzer warning:

net/wireless/wext-compat.c:1170:7: warning: Value stored to 'ps' during
its initialization is never read [clang-analyzer-deadcode.DeadStores]
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NYang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/1619603945-116891-1-git-send-email-yang.lee@linux.alibaba.comSigned-off-by: NJohannes Berg <johannes.berg@intel.com>