[mm-unstable PATCH] mm/memremap: fix pgmap_request_folio() stub

[Dan Williams <dan.j.williams@intel.com>]

0day robot reports:

include/linux/memremap.h:258:9: warning: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *'

...because I failed to update the pgmap_request_folio() return value in
the CONFIG_ZONE_DEVICE=n case when changing the calling convention.

Fixes: e634e7e18f3b ("mm/memremap: Introduce pgmap_request_folio() using pgmap offsets")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 include/linux/memremap.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index f11f827883bb..4a6eadf0d1d8 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -255,7 +255,7 @@ static inline struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
 static inline struct folio *pgmap_request_folio(struct dev_pagemap *pgmap,
 						pgoff_t pgmap_offset, int order)
 {
-	return false;
+	return NULL;
 }
 
 static inline bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn)