staging: vchiq_arm: Prefer kzalloc(sizeof(*waiter)...)

It's shorter and easier to maintain. This has been found with checkpatch.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1621105859-30215-11-git-send-email-stefan.wahren@i2se.com


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