debuggerd_test: remove useless pipe.

Bug: http://b/36897117
Test: none
Change-Id: Ib8369088153fe44de2af9037299bdfce7b709b98
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 1befcb1..ef7f0d4 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -498,9 +498,6 @@
 TEST(crash_dump, zombie) {
   pid_t forkpid = fork();
 
-  int pipefd[2];
-  ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
-
   pid_t rc;
   int status;