Add newline at end of error message

So the message gets flushed before the following abort.

Test: bionic-unit-tests without bionic-loader-test-libs at the expected
      relative path shows the error message.
Change-Id: I53bb27a88b73c9d8f4bb76560752f99a104d71ca
diff --git a/tests/gtest_globals.cpp b/tests/gtest_globals.cpp
index 607544a..4160237 100644
--- a/tests/gtest_globals.cpp
+++ b/tests/gtest_globals.cpp
@@ -29,7 +29,7 @@
 
   std::string out_path;
   if (!android::base::Realpath(path.c_str(), &out_path)) {
-    printf("Failed to get realpath for \"%s\"", path.c_str());
+    printf("Failed to get realpath for \"%s\"\n", path.c_str());
     abort();
   }
 
@@ -37,7 +37,7 @@
 
   std::string real_path;
   if (!android::base::Realpath(out_path, &real_path)) {
-    printf("\"%s\": does not exists", out_path.c_str());
+    printf("\"%s\": does not exists\n", out_path.c_str());
     abort();
   }