Modifies tests in test suite RSA

Modifies tests for mbedtls_rsa_rsassa_pkcs1_v15_sign
function in test_suite_rsa.function

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/tests/suites/test_suite_rsa.function b/tests/suites/test_suite_rsa.function
index f8bf859..e70faac 100644
--- a/tests/suites/test_suite_rsa.function
+++ b/tests/suites/test_suite_rsa.function
@@ -227,27 +227,22 @@
 
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsassa_pkcs1_v15_sign( NULL, NULL, NULL,
-                                                        valid_mode,
+                                                        MBEDTLS_RSA_PRIVATE,
                                                         0, sizeof( buf ), buf,
                                                         buf ) );
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsassa_pkcs1_v15_sign( &ctx, NULL, NULL,
-                                                        invalid_mode,
-                                                        0, sizeof( buf ), buf,
-                                                        buf ) );
-    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
-                            mbedtls_rsa_rsassa_pkcs1_v15_sign( &ctx, NULL, NULL,
-                                                        valid_mode,
+                                                        MBEDTLS_RSA_PRIVATE,
                                                         0, sizeof( buf ), NULL,
                                                         buf ) );
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsassa_pkcs1_v15_sign( &ctx, NULL, NULL,
-                                                        valid_mode,
+                                                        MBEDTLS_RSA_PRIVATE,
                                                         0, sizeof( buf ), buf,
                                                         NULL ) );
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_RSA_BAD_INPUT_DATA,
                             mbedtls_rsa_rsassa_pkcs1_v15_sign( &ctx, NULL, NULL,
-                                                        valid_mode,
+                                                        MBEDTLS_RSA_PRIVATE,
                                                         MBEDTLS_MD_SHA1,
                                                         0, NULL,
                                                         buf ) );