V4L/DVB: videobuf: rename videobuf_alloc to videobuf_alloc_vb

These functions allocate videobuf_buffer structures only. Renaming in order
to prevent confusion with functions allocating actual video buffer memory.

Rename the functions in videobuf-core.h videobuf-dma-sg.c as well.

Signed-off-by: Pawel Osciak <p.osciak@samsung.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
index f91a736..a157cd1 100644
--- a/include/media/videobuf-core.h
+++ b/include/media/videobuf-core.h
@@ -127,7 +127,7 @@
 struct videobuf_qtype_ops {
 	u32                     magic;
 
-	struct videobuf_buffer *(*alloc)(size_t size);
+	struct videobuf_buffer *(*alloc_vb)(size_t size);
 	void *(*vaddr)		(struct videobuf_buffer *buf);
 	int (*iolock)		(struct videobuf_queue *q,
 				 struct videobuf_buffer *vb,
@@ -173,7 +173,7 @@
 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
 		struct v4l2_framebuffer *fbuf);
 
-struct videobuf_buffer *videobuf_alloc(struct videobuf_queue *q);
+struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q);
 
 /* Used on videobuf-dvb */
 void *videobuf_queue_to_vaddr(struct videobuf_queue *q,