Cleanse memory using the new OPENSSL_cleanse() function.
I've covered all the memset()s I felt safe modifying, but may have missed some.
diff --git a/crypto/evp/p_open.c b/crypto/evp/p_open.c
index 6976f2a..5a933d1 100644
--- a/crypto/evp/p_open.c
+++ b/crypto/evp/p_open.c
@@ -101,7 +101,7 @@
 
 	ret=1;
 err:
-	if (key != NULL) memset(key,0,size);
+	if (key != NULL) OPENSSL_cleanse(key,size);
 	OPENSSL_free(key);
 	return(ret);
 	}