V4L/DVB (8340): videobuf: Fix gather spelling

Use "scatter gather" instead of "scatter gatter".
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/videobuf-dma-sg.c

 /*
  * helper functions for SG DMA video4linux capture buffers
  *
- * The functions expect the hardware being able to scatter gatter
+ * The functions expect the hardware being able to scatter gather
  * (i.e. the buffers are not linear in physical memory, but fragmented
  * into PAGE_SIZE chunks).  They also assume the driver does not need
  * to touch the video data.

drivers/media/video/videobuf-vmalloc.c

 /*
  * helper functions for vmalloc video4linux capture buffers
  *
- * The functions expect the hardware being able to scatter gatter
+ * The functions expect the hardware being able to scatter gather
  * (i.e. the buffers are not linear in physical memory, but fragmented
  * into PAGE_SIZE chunks).  They also assume the driver does not need
  * to touch the video data.

include/media/videobuf-dma-sg.h

 /*
  * helper functions for SG DMA video4linux capture buffers
  *
- * The functions expect the hardware being able to scatter gatter
+ * The functions expect the hardware being able to scatter gather
  * (i.e. the buffers are not linear in physical memory, but fragmented
  * into PAGE_SIZE chunks).  They also assume the driver does not need
  * to touch the video data.

include/media/videobuf-vmalloc.h

 /*
  * helper functions for vmalloc capture buffers
  *
- * The functions expect the hardware being able to scatter gatter
+ * The functions expect the hardware being able to scatter gather
  * (i.e. the buffers are not linear in physical memory, but fragmented
  * into PAGE_SIZE chunks).  They also assume the driver does not need
  * to touch the video data.