libct/int: waitProcess: rm dead code

Since Wait returns an ExitError if process' exit status is not 0,
checking process status is redundant and this code is never reached.

Remove it.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
(cherry picked from commit dd9fda7d60)
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/integration/utils_test.go

@@ -88,14 +88,10 @@ func ok(t testing.TB, err error) {
 
 func waitProcess(p *libcontainer.Process, t testing.TB) {
 	t.Helper()
-	status, err := p.Wait()
+	_, err := p.Wait()
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-
-	if !status.Success() {
-		t.Fatalf("unexpected status: %v", status)
-	}
 }
 
 // newRootfs creates a new tmp directory and copies the busybox root