mm/memblock.c: memblock_is_memory()/reserved() can be boolean

Make memblock_is_memory() and memblock_is_reserved return bool to
improve readability due to these particular functions only using either
one or zero as their return value.

No functional change.

Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memblock.c b/mm/memblock.c
index 07ff069..9695398 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1528,12 +1528,12 @@
 	return -1;
 }
 
-int __init memblock_is_reserved(phys_addr_t addr)
+bool __init memblock_is_reserved(phys_addr_t addr)
 {
 	return memblock_search(&memblock.reserved, addr) != -1;
 }
 
-int __init_memblock memblock_is_memory(phys_addr_t addr)
+bool __init_memblock memblock_is_memory(phys_addr_t addr)
 {
 	return memblock_search(&memblock.memory, addr) != -1;
 }