cert_data: fix memory leak

Release pCertName, if SecCertificateCopyValues() fails.

Found via cppcheck.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Vasily Kulikov <segoon@openwall.com>
Acked-by: Vasily Kulikov <segoon@openwall.com>
Message-Id: <1429540256-4906-1-git-send-email-yegorslists@googlemail.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9600
Signed-off-by: Gert Doering <gert@greenie.muc.de>

contrib/keychain-mcd/cert_data.c

@@ -146,6 +146,7 @@ CFArrayRef GetFieldsFromCertificate(SecCertificateRef certificate, CFTypeRef oid
       printErrorMsg("GetFieldsFromCertificate: SecCertificateCopyValues", error);
       CFRelease(keySelection);
       CFRelease(fields);
+      destroyCertName(pCertName);
       return NULL;
   }
   CFDictionaryRef vals = CFDictionaryGetValue(dict, oid);