dma-buf: use preferred struct reference in kernel-doc

sed -e 's/\( \* .*\)struct &\([_a-z]*\)/\1\&struct \2/' -i

Originally I wasnt a friend of this style because I thought a
line-break between the "&struct" and "foo" part would break it. But a
quick test shows that " * &struct \n * foo\n" works pefectly well with
current kernel-doc. So time to mass-apply these changes!

Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1483044517-5770-4-git-send-email-daniel.vetter@ffwll.ch

drivers/dma-buf/dma-buf.c

@@ -128,7 +128,7 @@ static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence)
  * DOC: fence polling
  *
  * To support cross-device and cross-driver synchronization of buffer access
- * implicit fences (represented internally in the kernel with struct &fence) can
+ * implicit fences (represented internally in the kernel with &struct fence) can
  * be attached to a &dma_buf. The glue for that and a few related things are
  * provided in the &reservation_object structure.
  *
@@ -373,7 +373,7 @@ static inline int is_dma_buf_file(struct file *file)
  * Additionally, provide a name string for exporter; useful in debugging.
  *
  * @exp_info:	[in]	holds all the export related information provided
- *			by the exporter. see struct &dma_buf_export_info
+ *			by the exporter. see &struct dma_buf_export_info
  *			for further details.
  *
  * Returns, on success, a newly created dma_buf object, which wraps the
@@ -517,7 +517,7 @@ EXPORT_SYMBOL_GPL(dma_buf_get);
  *
  * If, as a result of this call, the refcount becomes 0, the 'release' file
  * operation related to this fd is called. It calls the release operation of
- * struct &dma_buf_ops in turn, and frees the memory allocated for dmabuf when
+ * &struct dma_buf_ops in turn, and frees the memory allocated for dmabuf when
  * exported.
  */
 void dma_buf_put(struct dma_buf *dmabuf)

include/linux/dma-buf.h

@@ -278,7 +278,7 @@ struct dma_buf_ops {
  * Shared dma buffers are reference counted using dma_buf_put() and
  * get_dma_buf().
  *
- * Device DMA access is handled by the separate struct &dma_buf_attachment.
+ * Device DMA access is handled by the separate &struct dma_buf_attachment.
  */
 struct dma_buf {
 	size_t size;
@@ -355,7 +355,7 @@ struct dma_buf_export_info {
  * DEFINE_DMA_BUF_EXPORT_INFO - helper macro for exporters
  * @name: export-info name
  *
- * DEFINE_DMA_BUF_EXPORT_INFO macro defines the struct &dma_buf_export_info,
+ * DEFINE_DMA_BUF_EXPORT_INFO macro defines the &struct dma_buf_export_info,
  * zeroes it out and pre-populates exp_name in it.
  */
 #define DEFINE_DMA_BUF_EXPORT_INFO(name)	\