Fix a build issue when use external OpenSSL.

webrtc/base/opensslstreamadapter.cc

Index: webrtc/base/opensslstreamadapter.cc
diff --git a/webrtc/base/opensslstreamadapter.cc b/webrtc/base/opensslstreamadapter.cc
index 2b7eea869a190a4834d7d4e231f2794302182598..1330fc85099a36cb67227ced11ae092a53edd5c9 100644
--- a/webrtc/base/opensslstreamadapter.cc
+++ b/webrtc/base/opensslstreamadapter.cc
@@ -359,10 +359,9 @@ std::string OpenSSLStreamAdapter::GetSslCipherSuiteName(uint16_t cipher) {
   OPENSSL_free(cipher_name);
   return rfc_name;
 #else
-  ASSERT(cipher != NULL);
   for (const SslCipherMapEntry* entry = kSslCipherMap; entry->rfc_name;
        ++entry) {
-    if (cipher->id == entry->openssl_id) {
+    if (cipher == entry->openssl_id) {
       return entry->rfc_name;
     }
   }