Remove useless parameters for ecp_mod_add_sub

Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 346a015..3f810d2 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -1609,7 +1609,7 @@
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_TEST_HOOKS */
-void ecp_mod_add_sub(char *input_A, char *input_B, int id, int ctype, int iret)
+void ecp_mod_add_sub(char *input_A, char *input_B, int id, int ctype)
 {
     size_t p_limbs;
     size_t bytes;
@@ -1621,8 +1621,6 @@
     mbedtls_mpi_uint *p_B = NULL;
     mbedtls_mpi_uint *p_S = NULL;
 
-    ((void) iret);
-
     mbedtls_mpi_mod_modulus_init(&m);
 
     TEST_EQUAL(mbedtls_test_read_mpi_core(&p_A, &p_limbs, input_A), 0);