staging: bcm2835-audio: fix unnecessary space after cast

Fix issue reported by checkpatch:

CHECK: No space is necessary after a cast
FILE: drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c:240:

Signed-off-by: Adrien Thierry <athierry@redhat.com>
Link: https://lore.kernel.org/r/20220414181622.102049-4-athierry@redhat.com


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