[IA64] sparse cleanups

Fix some sparse warnings on ia64.  Large constants that should be long
instead of int.  Use NULL instead of 0.  Add some missing __iomem
casts.  Replace a non-C99 structure assignment.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index e4bfa9d..bb8770a 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -632,7 +632,7 @@
 		if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 			 return md;
 	}
-	return 0;
+	return NULL;
 }
 
 static efi_memory_desc_t *
@@ -652,7 +652,7 @@
 		if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 			 return md;
 	}
-	return 0;
+	return NULL;
 }
 
 u32
@@ -923,7 +923,7 @@
 void
 efi_memmap_init(unsigned long *s, unsigned long *e)
 {
-	struct kern_memdesc *k, *prev = 0;
+	struct kern_memdesc *k, *prev = NULL;
 	u64	contig_low=0, contig_high=0;
 	u64	as, ae, lim;
 	void *efi_map_start, *efi_map_end, *p, *q;