Use correct conversion for ArrayList to array.

Bug: 24613146
Change-Id: I165e7cf0e788789be523858f839e4085fde5de2b
diff --git a/src/com/android/services/telephony/ImsConference.java b/src/com/android/services/telephony/ImsConference.java
index 58868d0..b911105 100644
--- a/src/com/android/services/telephony/ImsConference.java
+++ b/src/com/android/services/telephony/ImsConference.java
@@ -598,7 +598,8 @@
                         new ArrayList<>(Arrays.asList(imsPhone.getCurrentSubscriberUris())));
             }
 
-            mConferenceHostAddress = (Uri[])hostAddresses.toArray();
+            mConferenceHostAddress = new Uri[hostAddresses.size()];
+            mConferenceHostAddress = hostAddresses.toArray(mConferenceHostAddress);
         }
 
         mConferenceHost.addConnectionListener(mConferenceHostListener);