files: Initialize remap->is_dir for linked remap (to false)

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

files-reg.c

@@ -220,6 +220,7 @@ static int open_remap_linked(struct reg_file_info *rfi,
 
 	rm->path = rrfi->path;
 	rm->users = 0;
+	rm->is_dir = false;
 	rfi->remap = rm;
 	return 0;
 }