driverfs: Remove references to struct driver_file_entry::dentry, as we don't use it

for anything useful anymore.

fs/driverfs/inode.c

@@ -656,7 +656,6 @@ driverfs_create_file(struct driver_file_entry * entry,
 		/* Still good? Ok, then fill in the blanks: */
 		if (!error) {
 			dentry->d_inode->u.generic_ip = (void *)entry;
-			entry->dentry = dentry;
 			entry->parent = parent;
 		}
 	} else
@@ -701,7 +700,6 @@ int driverfs_create_symlink(struct driver_dir_entry * parent,
 		error = driverfs_symlink(parent->dentry->d_inode,dentry,target);
 		if (!error) {
 			dentry->d_inode->u.generic_ip = (void *)entry;
-			entry->dentry = dentry;
 			entry->parent = parent;
 		}
 	} else

include/linux/driverfs_fs.h

@@ -38,7 +38,6 @@ struct driver_file_entry {
 	struct driver_dir_entry * parent;
 	char			* name;
 	mode_t			mode;
-	struct dentry		* dentry;
 
 	ssize_t (*show)(struct device * dev, char * buf, size_t count, loff_t off);
 	ssize_t (*store)(struct device * dev, const char * buf, size_t count, loff_t off);