GCM in the cipher layer, step 1

- no support for additional data
- no support for tag
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index 1f7943a4..5377208 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -248,7 +248,7 @@
     TEST_ASSERT( totaloutlen == length ||
                  ( totaloutlen % cipher_get_block_size( &ctx_dec ) == 0 &&
                    totaloutlen < length &&
-                   totaloutlen + cipher_get_block_size( &ctx_dec ) > length ) );
+                   totaloutlen + cipher_get_block_size( &ctx_dec ) >= length ) );
 
     TEST_ASSERT( 0 == cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
     totaloutlen += outlen;