flash/nor: missing fileio_close.

If the file read abnormally, need to close it which was opened before.

Signed-off-by: panciyan <panciyan@eswincomputing.com>
Change-Id: I6142f154741dcd38088b7add2793219ee4dd2ae9
Reviewed-on: https://review.openocd.org/c/openocd/+/7546
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/flash/nor/tcl.c

@@ -814,6 +814,7 @@ COMMAND_HANDLER(handle_flash_write_bank_command)
 	if (buf_cnt != length) {
 		LOG_ERROR("Short read");
 		free(buffer);
+		fileio_close(fileio);
 		return ERROR_FAIL;
 	}