new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/file_table.c b/fs/file_table.c
index de9e965..0f607ce 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -447,7 +447,7 @@
 
 	lg_global_lock(&files_lglock);
 	do_file_list_for_each_entry(sb, f) {
-		if (!S_ISREG(f->f_path.dentry->d_inode->i_mode))
+		if (!S_ISREG(file_inode(f)->i_mode))
 		       continue;
 		if (!file_count(f))
 			continue;