debuggerd_test: remove useless pipe.

Bug: http://b/36897117
Test: none
Change-Id: Ib8369088153fe44de2af9037299bdfce7b709b98
(cherry picked from commit 951cf7007147168164e8cd60ff093627f387aad7)
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index fa2838e..b705e27 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -500,9 +500,6 @@
 TEST(crash_dump, zombie) {
   pid_t forkpid = fork();
 
-  int pipefd[2];
-  ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
-
   pid_t rc;
   int status;