Staging: tm6000: remove unneeded check in get_next_buf()

We dereference "buf" on the line before so if it were NULL here we
would have OOPsed earlier.  Also list_entry() never returns NULL.
And finally, we handled the situation where the list is empty
earlier in the function.

So this test isn't needed and I've removed it.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/tm6000/tm6000-video.c

@@ -179,9 +179,6 @@ static inline void get_next_buf(struct tm6000_dmaqueue *dma_q,
 	*buf = list_entry(dma_q->active.next,
 			struct tm6000_buffer, vb.queue);
 
-	if (!buf)
-		return;
-
 	/* Cleans up buffer - Useful for testing for frame/URB loss */
 	outp = videobuf_to_vmalloc(&(*buf)->vb);