x86/rtc: Simplify PNP ids check

compare_pnp_id() already iterates over the single linked pnp_ids list
starting with the id past to it.

So there is no need for add_rtc_cmos() to call compare_pnp_id()
for each id on the list.

No change in functionality intended.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: linux-kernel@vger.kernel.org

arch/x86/kernel/rtc.c

@@ -138,15 +138,12 @@ static __init int add_rtc_cmos(void)
 	static const char * const ids[] __initconst =
 	    { "PNP0b00", "PNP0b01", "PNP0b02", };
 	struct pnp_dev *dev;
-	struct pnp_id *id;
 	int i;
 
 	pnp_for_each_dev(dev) {
-		for (id = dev->id; id; id = id->next) {
-			for (i = 0; i < ARRAY_SIZE(ids); i++) {
-				if (compare_pnp_id(id, ids[i]) != 0)
-					return 0;
-			}
+		for (i = 0; i < ARRAY_SIZE(ids); i++) {
+			if (compare_pnp_id(dev->id, ids[i]) != 0)
+				return 0;
 		}
 	}
 #endif