target/riscv: fix close fileio and free temp when conditions are met

- When `fileio` is valid, close it;
- When `temp` exists, free its memory;
- This ensures proper resource management.

Change-Id: I66be66e3945415f2e970ea47c077942be5977541
Signed-off-by: Huaqi Fang <578567190@qq.com>

src/target/riscv/nuclei_riscv.c

@@ -691,9 +691,9 @@ fail:
 	LOG_ERROR("Unexpected error happened during dumping etrace!");
 	retval = ERROR_OK;
 ok:
-	if (!fileio)
+	if (fileio)
 		fileio_close(fileio);
-	if (!temp)
+	if (temp)
 		free(temp);
 
 	return retval;