staging: iio: kfifo buffer - push structure definition down into implementation.

Nothing other than the implementation needs to know about this.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/kfifo_buf.c

@@ -8,6 +8,14 @@
 
 #include "kfifo_buf.h"
 
+struct iio_kfifo {
+	struct iio_ring_buffer ring;
+	struct kfifo kf;
+	int use_count;
+	int update_needed;
+	struct mutex use_lock;
+};
+
 #define iio_to_kfifo(r) container_of(r, struct iio_kfifo, ring)
 
 static inline int __iio_allocate_kfifo(struct iio_kfifo *buf,

drivers/staging/iio/kfifo_buf.h

@@ -3,14 +3,6 @@
 #include "iio.h"
 #include "ring_generic.h"
 
-struct iio_kfifo {
-	struct iio_ring_buffer ring;
-	struct kfifo kf;
-	int use_count;
-	int update_needed;
-	struct mutex use_lock;
-};
-
 extern const struct iio_ring_access_funcs kfifo_access_funcs;
 
 struct iio_ring_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev);