Revert "staging: vc04_services: prevent integer overflow in create_pagelist()"

This reverts commit cf07331c which was
commit ca641bae upstream.

Martin writes:
	This commit breaks the kernel build because the vchiq_pagelist_info
	struct is not defined in v4.9.182.

	It was only added in v4.10, in commit
	4807f2c0.
Reported-by: Martin Weinelt <martin@linuxlounge.net>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -381,18 +381,9 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
 	int run, addridx, actual_pages;
         unsigned long *need_release;
 
-	if (count >= INT_MAX - PAGE_SIZE)
-		return NULL;
-
 	offset = (unsigned int)buf & (PAGE_SIZE - 1);
 	num_pages = (count + offset + PAGE_SIZE - 1) / PAGE_SIZE;
 
-	if (num_pages > (SIZE_MAX - sizeof(PAGELIST_T) -
-			 sizeof(struct vchiq_pagelist_info)) /
-			(sizeof(u32) + sizeof(pages[0]) +
-			 sizeof(struct scatterlist)))
-		return NULL;
-
 	*ppagelist = NULL;
 
 	/* Allocate enough storage to hold the page pointers and the page