staging: comedi: s626: remove unused DMAHandle

The `DMAHandle` member of `struct bufferDMA` in "s626.h" is unused, so
remove it.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/s626.h

@@ -631,7 +631,6 @@
 struct bufferDMA {
 	dma_addr_t PhysicalBase;
 	void *LogicalBase;
-	uint32_t DMAHandle;
 };
 
 #endif