ueventd: Fix wrong argument index in devpath comparison

args[2](user name to run as) is used instead of args[1](devpath).

Test: atest CtsInitTestCases
Signed-off-by: Suchang Woo <suchang.woo@samsung.com>
Change-Id: Id271755993d55e332bad54d0414e2232071e5e8e