[PATCH] iio: declare struct to fix warning

[Aaron Ma]

When compile iio related driver the following warning shown:

include/linux/iio/trigger.h:35:34: warning: 'struct iio_trigger'
declared inside parameter list
  int (*set_trigger_state)(struct iio_trigger *trig, bool state);

include/linux/iio/trigger.h:38:18: warning: 'struct iio_dev'
declared inside parameter list
           struct iio_dev *indio_dev);

1st warning: 'struct iio_trigger' was used before declaration;
2nd warning: 'struct iio_dev' was used without including head file.

Signed-off-by: Pengyu Ma <mapengyu@xxxxxxxxx>
---
 include/linux/iio/trigger.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
index 68f46cd..cbe4286 100644
--- a/include/linux/iio/trigger.h
+++ b/include/linux/iio/trigger.h
@@ -9,6 +9,7 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/atomic.h>
+#include <linux/iio/iio.h>

 #ifndef _IIO_TRIGGER_H_
 #define _IIO_TRIGGER_H_
@@ -18,6 +19,8 @@ struct iio_subirq {
  bool enabled;
 };

+struct iio_trigger; /* forward declaration */
+
 /**
  * struct iio_trigger_ops - operations structure for an iio_trigger.
  * @owner: used to monitor usage count of the trigger.
-- 
2.0.1
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