tests/: Assert on NULL heap allocations in tests

Change-Id: Id2adcfe859fb25d2a7f0734655c6b9a58c0890b6
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/71919
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>

tests/chip_wp.c

@@ -269,6 +269,7 @@ void full_chip_erase_with_wp_dummyflasher_test_success(void **state)
 	 * be optimized away. */
 	unsigned long size = flashrom_flash_getsize(&flash);
 	uint8_t *const contents = malloc(size);
+	assert_non_null(contents);
 	memset(contents, UNERASED_VALUE(&flash), size);
 	assert_int_equal(0, flashrom_image_write(&flash, contents, size, NULL));
 	free(contents);