rt2x00: fix clk_get call

clk_get() takes two arguments and might return ERR_PTR(), so we
have to nullify pointer on that case, to do not break further call
to clk_get_rate().

Reported-by: Felix Fietkau <nbd@nbd.name>
Fixes: 34db70b92fae ("rt2x00: add copy of clk for soc devices")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

path: root/sound/soc/dwc/Kconfig

config SND_DESIGNWARE_I2S
	tristate "Synopsys I2S Device Driver"
	depends on CLKDEV_LOOKUP
	select SND_SOC_GENERIC_DMAENGINE_PCM
	help
	 Say Y or M if you want to add support for I2S driver for
	 Synopsys desigwnware I2S device. The device supports upto
	 maximum of 8 channels each for play and record.

config SND_DESIGNWARE_PCM
	tristate "PCM PIO extension for I2S driver"
	depends on SND_DESIGNWARE_I2S
	help
	 Say Y, M or N if you want to add a custom ALSA extension that registers
	 a PCM and uses PIO to transfer data.

	 This functionality is specially suited for I2S devices that don't have
	 DMA support.