[PATCH] staging: gpib: Fix error code in board_type_ioctl()

[Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>]

When copy_from_user() fails it return number of bytes it wasn't able to
copy. So the correct return value when copy_from_user() fails is
-EFAULT.

Fixes: 9dde4559e939 ("staging: gpib: Add GPIB common core driver")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
---
This is found using static analysis with Smatch. Only compile tested
---
 drivers/staging/gpib/common/gpib_os.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/gpib/common/gpib_os.c b/drivers/staging/gpib/common/gpib_os.c
index a193d64db033..cd7ea7f4fbae 100644
--- a/drivers/staging/gpib/common/gpib_os.c
+++ b/drivers/staging/gpib/common/gpib_os.c
@@ -831,7 +831,7 @@ static int board_type_ioctl(struct gpib_file_private *file_priv,
 	retval = copy_from_user(&cmd, (void __user *)arg,
 				sizeof(struct gpib_board_type_ioctl));
 	if (retval)
-		return retval;
+		return -EFAULT;
 
 	for (list_ptr = registered_drivers.next; list_ptr != &registered_drivers;
 	     list_ptr = list_ptr->next) {
-- 
2.39.3