For tests, rename TEST_CALLOC_OR_FAIL() to just TEST_CALLOC()

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/tests/suites/test_suite_pkwrite.function b/tests/suites/test_suite_pkwrite.function
index 764c55c..88d0dd2 100644
--- a/tests/suites/test_suite_pkwrite.function
+++ b/tests/suites/test_suite_pkwrite.function
@@ -58,7 +58,7 @@
     }
     TEST_ASSERT(check_buf_len > 0);
 
-    TEST_CALLOC_OR_FAIL(buf, check_buf_len);
+    TEST_CALLOC(buf, check_buf_len);
 
     if (is_public_key) {
         TEST_EQUAL(mbedtls_pk_parse_public_keyfile(&key, key_file), 0);
@@ -145,7 +145,7 @@
                                     &pub_key_len), 0);
 
     derived_key_len = pub_key_len;
-    TEST_CALLOC_OR_FAIL(derived_key_raw, derived_key_len);
+    TEST_CALLOC(derived_key_raw, derived_key_len);
 
     TEST_EQUAL(mbedtls_pk_write_pubkey_der(&priv_key, derived_key_raw,
                                            derived_key_len), pub_key_len);