Simplify PSA transform->ivlen set in ssl_tls12_populate_transform()

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 2175734..ab1d9e4 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -7114,10 +7114,7 @@
 
         /* IV length */
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
-        if( ssl_mode == MBEDTLS_SSL_MODE_STREAM )
-            transform->ivlen = 0;
-        else
-            transform->ivlen = PSA_CIPHER_IV_LENGTH( key_type, alg );
+        transform->ivlen = PSA_CIPHER_IV_LENGTH( key_type, alg );
 #else
         transform->ivlen = cipher_info->iv_size;
 #endif /* MBEDTLS_USE_PSA_CRYPTO */