V4L/DVB (7566): videobuf-dvb: allow its usage with videobuf-vmalloc

videobuf-dvb were still using a function that were videobuf-dma-sg
dependent. This patch creates a generic handler for this function. This
way, videobuf-dvb can now work with all videobuf implementations.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

include/media/videobuf-vmalloc.h

@@ -12,6 +12,8 @@
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2
  */
+#ifndef _VIDEOBUF_VMALLOC_H
+#define _VIDEOBUF_VMALLOC_H
 
 #include <media/videobuf-core.h>
 
@@ -39,3 +41,5 @@ void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
 void *videobuf_to_vmalloc (struct videobuf_buffer *buf);
 
 void videobuf_vmalloc_free (struct videobuf_buffer *buf);
+
+#endif