Constification of CRYPTO_get_ex_data() needed for the sake of
RSA_get_ext_data().
diff --git a/crypto/ex_data.c b/crypto/ex_data.c
index 739e543..35ea2c2 100644
--- a/crypto/ex_data.c
+++ b/crypto/ex_data.c
@@ -131,7 +131,7 @@
 	return(1);
 	}
 
-void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *ad, int idx)
+void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
 	{
 	if (ad->sk == NULL)
 		return(0);