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[PATCH] ASoC: codecs: fix pcm1789.c build errors

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Fix build errors in pcm1789.c.
The source file needs to #include <linux/gpio/consumer.h> since it
uses interfaces and macros that are provided by it.
However, it does not need to #include <linux/gpio.h>, so drop it.

Fixes these build errors:

../sound/soc/codecs/pcm1789.c: In function 'pcm1789_common_init':
../sound/soc/codecs/pcm1789.c:247:2: error: implicit declaration of function 'devm_gpiod_get_optional' [-Werror=implicit-function-declaration]
  pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
../sound/soc/codecs/pcm1789.c:247:57: error: 'GPIOD_OUT_HIGH' undeclared (first use in this function)
  pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
../sound/soc/codecs/pcm1789.c:251:2: error: implicit declaration of function 'gpiod_set_value_cansleep' [-Werror=implicit-function-declaration]
  gpiod_set_value_cansleep(pcm1789->reset, 0);

Fixes: 4ae340d1be36 ("ASoC: codecs: Add support for PCM1789")
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Mylène Josserand <mylene.josserand@xxxxxxxxxxx>
Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: alsa-devel@xxxxxxxxxxxxxxxx
 sound/soc/codecs/pcm1789.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

BTW, MODULE_AUTHOR() still uses @free-electrons.com.

--- lnx-417-rc4.orig/sound/soc/codecs/pcm1789.c
+++ lnx-417-rc4/sound/soc/codecs/pcm1789.c
@@ -3,7 +3,7 @@
 // Copyright (C) 2018 Bootlin
 // Mylène Josserand <mylene.josserand@xxxxxxxxxxx>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/workqueue.h>