NetlinkSocketTest.java - replace U32 ifindex with S32

These are allocated in order by the kernel, if we go
over 2 billion, we've got other problems... besides
U32 to S32 conversion will work just fine anyway.

(apparently this field is never accessed, as the test only looks at family)

Bug: 245472520
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I879c1637a87587b7bc1c13013ea9c5e655c141eb
diff --git a/staticlibs/tests/unit/src/com/android/net/module/util/netlink/NetlinkSocketTest.java b/staticlibs/tests/unit/src/com/android/net/module/util/netlink/NetlinkSocketTest.java
index 33ea602..f4073b6 100644
--- a/staticlibs/tests/unit/src/com/android/net/module/util/netlink/NetlinkSocketTest.java
+++ b/staticlibs/tests/unit/src/com/android/net/module/util/netlink/NetlinkSocketTest.java
@@ -236,7 +236,7 @@
         @Field(order = 3, type = Type.U8)
         public short scope;
 
-        @Field(order = 4, type = Type.U32)
-        public long index;
+        @Field(order = 4, type = Type.S32)
+        public int index;
     }
 }