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/drivers/media/video/videobuf-vmalloc.c b/drivers/media/video/videobuf-vmalloc.c
index 583728f..cf5be6b 100644
--- a/drivers/media/video/videobuf-vmalloc.c
+++ b/drivers/media/video/videobuf-vmalloc.c
@@ -135,7 +135,7 @@
 	struct videobuf_dma_sg_memory
  */
 
-static struct videobuf_buffer *__videobuf_alloc(size_t size)
+static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
 {
 	struct videobuf_vmalloc_memory *mem;
 	struct videobuf_buffer *vb;
@@ -293,7 +293,7 @@
 static struct videobuf_qtype_ops qops = {
 	.magic        = MAGIC_QTYPE_OPS,
 
-	.alloc        = __videobuf_alloc,
+	.alloc_vb     = __videobuf_alloc_vb,
 	.iolock       = __videobuf_iolock,
 	.mmap_mapper  = __videobuf_mmap_mapper,
 	.vaddr        = videobuf_to_vmalloc,