ceph: fix dout() compile warnings in ceph_filemap_fault()

PAGE_CACHE_SIZE is unsigned long on all architectures, however size_t
is either unsigned int or unsigned long.  Rather than change format
strings, cast PAGE_CACHE_SIZE to size_t to be in line with dout()s in
ceph_page_mkwrite().

Cc: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

fs/ceph/addr.c

@@ -1220,7 +1220,7 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	int want, got, ret;
 
 	dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
-	     inode, ceph_vinop(inode), off, PAGE_CACHE_SIZE);
+	     inode, ceph_vinop(inode), off, (size_t)PAGE_CACHE_SIZE);
 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
 		want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 	else
@@ -1236,12 +1236,12 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 		}
 	}
 	dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
-	     inode, off, PAGE_CACHE_SIZE, ceph_cap_string(got));
+	     inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got));
 
 	ret = filemap_fault(vma, vmf);
 
 	dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
-	     inode, off, PAGE_CACHE_SIZE, ceph_cap_string(got), ret);
+	     inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret);
 	ceph_put_cap_refs(ci, got);
 
 	return ret;