Remove braces around scalar initializer.

This fixes building with clang.

Change-Id: Ieaee822383ebbbd4f15eeea1e993b936096a4d95
diff --git a/google_keymaster_test.cpp b/google_keymaster_test.cpp
index efa6f13..6b0c861 100644
--- a/google_keymaster_test.cpp
+++ b/google_keymaster_test.cpp
@@ -135,7 +135,7 @@
 
     EXPECT_EQ(KM_ERROR_OK, device()->get_supported_digests(device(), KM_ALGORITHM_EC,
                                                            KM_PURPOSE_SIGN, &digests, &len));
-    EXPECT_TRUE(ResponseContains({KM_DIGEST_NONE}, digests, len));
+    EXPECT_TRUE(ResponseContains(KM_DIGEST_NONE, digests, len));
     free(digests);
 
     EXPECT_EQ(KM_ERROR_UNSUPPORTED_PURPOSE,