CookieTagMapValue.java - uid U32 -> S32

The kernel is actually not consistent in whether uids & gids
are signed or unsigned, and neither is our Java code, which
also commonly uses just 'int' for uid.  In practice values
greater or equal to 2**31 often don't quite work right.
For example icmp sockets are enabled via a sysctl that
takes a minimum and maximum gid - and these are signed int32s.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I6576798cfeb52bf5574bf6853f0f7378022b3a2f

common/src/com/android/net/module/util/bpf/CookieTagMapValue.java

@@ -24,13 +24,13 @@ import com.android.net.module.util.Struct.Type;
  * Value for cookie tag map.
  */
 public class CookieTagMapValue extends Struct {
-    @Field(order = 0, type = Type.U32)
-    public final long uid;
+    @Field(order = 0, type = Type.S32)
+    public final int uid;
 
     @Field(order = 1, type = Type.U32)
     public final long tag;
 
-    public CookieTagMapValue(final long uid, final long tag) {
+    public CookieTagMapValue(final int uid, final long tag) {
         this.uid = uid;
         this.tag = tag;
     }