debugfs: change parameter check in debugfs_remove() functions

The dentry parameter in debugfs_remove() and debugfs_remove_recursive()
is checked being a NULL pointer. To make cleanup by callers easier this
check is extended using the IS_ERR_OR_NULL macro instead because the
debugfs_create_... functions can return a ERR_PTR() value.

Signed-off-by: Arend van Spriel <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

fs/debugfs/inode.c

···
 	struct dentry *parent;
 	int ret;
 
-	if (!dentry)
+	if (IS_ERR_OR_NULL(dentry))
 		return;
 
 	parent = dentry->d_parent;
···
 	struct dentry *child;
 	struct dentry *parent;
 
-	if (!dentry)
+	if (IS_ERR_OR_NULL(dentry))
 		return;
 
 	parent = dentry->d_parent;