staging: mmal-vchiq: clear redundant item named bulk_scratch

bulk_scratch is not used anywhere and the original allocation of it
does not have proper check.
Deleting it directly seems to be a good choice.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Link: https://lore.kernel.org/r/tencent_F721901366AB5C720E008AF7F02DA5D3FF07@qq.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>