As reported by smatch:

	drivers/media/pci/saa7134/saa7134-alsa.c:267 saa7134_alsa_dma_init() warn: should 'nr_pages << 12' be a 64 bit type?

the number of patches should be unsigned long.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>