convert BpfDumpTest from U32 to S32

no need to use U32, of which uses I'd like to eliminate wherever possible

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8c0a2df73c4153b21d33ee7a8f5d434f0fc80103
1 file changed
tree: 85729abd47a59c09bf1b1910b465b2345bcd72da
  1. staticlibs/