staging: vc04_services: Using macro DIV_ROUND_UP

The macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /(d)).
It clarifies the divisor calculations. This occurence was detected using
the coccinelle script:

@@
expression e1;
expression e2;
@@
(
- ((e1) + e2 - 1) / (e2)
+ DIV_ROUND_UP(e1,e2)
|
- ((e1) + (e2 - 1)) / (e2)
+ DIV_ROUND_UP(e1,e2)
)
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c

@@ -408,7 +408,7 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
 	dma_addr_t dma_addr;
 
 	offset = ((unsigned int)(unsigned long)buf & (PAGE_SIZE - 1));
-	num_pages = (count + offset + PAGE_SIZE - 1) / PAGE_SIZE;
+	num_pages = DIV_ROUND_UP(count + offset, PAGE_SIZE);
 
 	pagelist_size = sizeof(PAGELIST_T) +
 			(num_pages * sizeof(u32)) +

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c

@@ -1587,7 +1587,7 @@ dump_phys_mem(void *virt_addr, u32 num_bytes)
 	offset = (int)(long)virt_addr & (PAGE_SIZE - 1);
 	end_offset = (int)(long)end_virt_addr & (PAGE_SIZE - 1);
 
-	num_pages = (offset + num_bytes + PAGE_SIZE - 1) / PAGE_SIZE;
+	num_pages = DIV_ROUND_UP(offset + num_bytes, PAGE_SIZE);
 
 	pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
 	if (pages == NULL) {