init: fix return value for android uid/gid check

Now get_android_id function returns -EINVAL if the uid/gid is not in the list
of android ids. This will allow ueventd to catch invalid ids and report the
error.

Change-Id: I943b04dd64d518891623e1ee2d561b8061af4863
Signed-off-by: Veeren Mandalia <v.mandalia@sta.samsung.com>
diff --git a/init/ueventd.c b/init/ueventd.c
index a89e067..a41c31e 100644
--- a/init/ueventd.c
+++ b/init/ueventd.c
@@ -105,7 +105,7 @@
     for (i = 0; i < ARRAY_SIZE(android_ids); i++)
         if (!strcmp(id, android_ids[i].name))
             return android_ids[i].aid;
-    return 0;
+    return -1;
 }
 
 void set_device_permission(int nargs, char **args)