Merge pull request #868 from sipa/fix_650

Fix #650: CKey::SetSecret BIGNUM leak

src/key.h

@@ -144,7 +144,10 @@ public:
         if (bn == NULL)
             throw key_error("CKey::SetSecret() : BN_bin2bn failed");
         if (!EC_KEY_regenerate_key(pkey,bn))
+        {
+            BN_clear_free(bn);
             throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
+        }
         BN_clear_free(bn);
         fSet = true;
         if (fCompressed || fCompressedPubKey)