Add missing logging codepaths for client certificate lookup.

net/ssl/ssl_platform_key_mac.cc

Index: net/ssl/ssl_platform_key_mac.cc
diff --git a/net/ssl/ssl_platform_key_mac.cc b/net/ssl/ssl_platform_key_mac.cc
index 439e06b5a6d8fe77c48e0f9f9b4942401938fdc0..4000c61496450ac4f1621f3f140084b35b5d09f5 100644
--- a/net/ssl/ssl_platform_key_mac.cc
+++ b/net/ssl/ssl_platform_key_mac.cc
@@ -221,8 +221,10 @@ scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
 
   const CSSM_KEY* cssm_key;
   OSStatus status = SecKeyGetCSSMKey(private_key.get(), &cssm_key);
-  if (status != noErr)
+  if (status != noErr) {
+    OSSTATUS_LOG(WARNING, status);
     return nullptr;
+  }
 
   SSLPrivateKey::Type key_type;
   size_t max_length;