Fix typo

Fix typo that was caught during review.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/programs/pkey/ecdh_curve25519.c b/programs/pkey/ecdh_curve25519.c
index e435b03..690f968 100644
--- a/programs/pkey/ecdh_curve25519.c
+++ b/programs/pkey/ecdh_curve25519.c
@@ -135,7 +135,7 @@
                                     mbedtls_ctr_drbg_random, &ctr_drbg );
     if( ret != 0 )
     {
-        mbedtls_printf( " failed\n  ! mbedtls_ecdh_make_params returned %d\n",
+        mbedtls_printf( " failed\n  ! mbedtls_ecdh_make_public returned %d\n",
                         ret );
         goto exit;
     }