usb: gadget: remove useless cast

Remove the cast done by ERR_PTR() and PTR_ERR() since data is of type char
* and fss_prepare_buffer() should returns a value of this type.

Acked-by: Felipe Balbi <[e-mail]>
Signed-off-by: Salah Triki <[e-mail]>
Link: https://lore.kernel.org/r/20210731171838.GA912463@pc
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/gadget/function/f_fs.c

···
 
 	data = memdup_user(buf, len);
 	if (IS_ERR(data))
-		return ERR_PTR(PTR_ERR(data));
+		return data;
 
 	pr_vdebug("Buffer from user space:\n");
 	ffs_dump_mem("", data, len);