[PATCH -next] USB: gadget: f_fs: Remove unneed cast in ffs_prepare_buffer()

[YueHaibing]

A coccicheck run provided information like the following.

./drivers/usb/gadget/function/f_fs.c:3832:9-16:
 WARNING: ERR_CAST can be used with data

ffs_prepare_buffer() should return an ERR_PTR() encoded error
code on failure.

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/usb/gadget/function/f_fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index bf109191659a..cb419bbd089c 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -3829,7 +3829,7 @@ static char *ffs_prepare_buffer(const char __user *buf, size_t len)
 
 	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);
-- 
2.17.1