include/linux/pfn_t.h: remove pfn_t_to_virt()

It has no callers and there is no virt_to_pfn_t().
Reported-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/pfn_t.h

@@ -66,13 +66,6 @@ static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
 	return PFN_PHYS(pfn_t_to_pfn(pfn));
 }
 
-static inline void *pfn_t_to_virt(pfn_t pfn)
-{
-	if (pfn_t_has_page(pfn) && !is_device_private_page(pfn_t_to_page(pfn)))
-		return __va(pfn_t_to_phys(pfn));
-	return NULL;
-}
-
 static inline pfn_t page_to_pfn_t(struct page *page)
 {
 	return pfn_to_pfn_t(page_to_pfn(page));