update engine: 32- and 64-bit compile

src/platform/update_engine/test_utils.cc

Index: src/platform/update_engine/test_utils.cc
diff --git a/src/platform/update_engine/test_utils.cc b/src/platform/update_engine/test_utils.cc
index 1c2f8959a115745ec89097f2511094358e7fe84d..6a86025456ddb9af2915e36fb30d4f128bc328f0 100644
--- a/src/platform/update_engine/test_utils.cc
+++ b/src/platform/update_engine/test_utils.cc
@@ -57,14 +57,15 @@ std::string Readlink(const std::string& path) {
 std::vector<char> GzipCompressData(const std::vector<char>& data) {
   const char fname[] = "/tmp/GzipCompressDataTemp";
   if (!WriteFileVector(fname, data)) {
-    system((string("rm ") + fname).c_str());
+    EXPECT_EQ(0, system((string("rm ") + fname).c_str()));
     return vector<char>();
   }
-  system((string("cat ") + fname + "|gzip>" + fname + ".gz").c_str());
-  system((string("rm ") + fname).c_str());
+  EXPECT_EQ(0, system((string("cat ") + fname + "|gzip>" +
+                       fname + ".gz").c_str()));
+  EXPECT_EQ(0, system((string("rm ") + fname).c_str()));
   vector<char> ret;
   EXPECT_TRUE(utils::ReadFile(string(fname) + ".gz", &ret));
-  system((string("rm ") + fname + ".gz").c_str());
+  EXPECT_EQ(0, system((string("rm ") + fname + ".gz").c_str()));
   return ret;
 }