win: Fix a few minor issues found by clang.

crypto/rsa_private_key_win.cc

Index: crypto/rsa_private_key_win.cc
diff --git a/crypto/rsa_private_key_win.cc b/crypto/rsa_private_key_win.cc
index d87c1ec058a79f849b22bc33482842c85d67d2ca..dc48a58d38f4e195b560bdcaffc62f3c985e9e01 100644
--- a/crypto/rsa_private_key_win.cc
+++ b/crypto/rsa_private_key_win.cc
@@ -12,15 +12,6 @@
 
 #pragma comment(lib, "crypt32.lib")
 
-namespace {
-  // Helper for error handling during key import.
-#define READ_ASSERT(truth) \
-  if (!(truth)) { \
-  NOTREACHED(); \
-  return false; \
-  }
-}  // namespace
-
 namespace crypto {
 
 // static
@@ -102,7 +93,10 @@ RSAPrivateKey* RSAPrivateKey::CreateFromPrivateKeyInfo(
          pki.private_exponent()->size());
   dest += pki.private_exponent()->size();
 
-  READ_ASSERT(dest == blob.get() + blob_size);
+  if (dest != blob.get() + blob_size) {
+    NOTREACHED();
+    return NULL;
+  }
   if (!CryptImportKey(result->provider_,
                       reinterpret_cast<uint8*>(public_key_struc), blob_size, 0,
                       CRYPT_EXPORTABLE, result->key_.receive()))