update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_FIREWIRE_SERIAL) += firewire-serial.o
firewire-serial-objs := fwserial.o dma_fifo.o