debugfs: debugfs_create_file_size(): use IS_ERR to check for error

debugfs_create_file() returns encoded error so use IS_ERR for checking
return value.

Reviewed-by: Christian König <[email protected]>
Signed-off-by: Nirmoy Das <[email protected]>
Fixes: ff9fb72 ("debugfs: return error values, not NULL")
Cc: stable <[email protected]>
References: https://gitlab.freedesktop.org/drm/amd/-/issues/1686
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Nirmoy Das

fs/debugfs/inode.c

@@ -528,7 +528,7 @@ void debugfs_create_file_size(const char *name, umode_t mode,
 {
 	struct dentry *de = debugfs_create_file(name, mode, parent, data, fops);
 
-	if (de)
+	if (!IS_ERR(de))
 		d_inode(de)->i_size = file_size;
 }
 EXPORT_SYMBOL_GPL(debugfs_create_file_size);