IpSecService: Actually throw exception

Add a missing throw.

Bug: 19797138
Test: m
Test: Device boots
Change-Id: I6c6058ecc95a5b85da43a42bac2846c31cefc038

services/core/java/com/android/server/IpSecService.java

@@ -343,7 +343,7 @@ public class IpSecService extends IIpSecService.Stub {
         public void setOwnedByTransform() {
             if (mOwnedByTransform) {
                 // Programming error
-                new IllegalStateException("Cannot own an SPI twice!");
+                throw new IllegalStateException("Cannot own an SPI twice!");
             }
 
             mOwnedByTransform = true;