[PATCH] staging:gpib: Fix a dereference before null check issue

[Paolo Perego <pperego@suse.de>]

This commit fixes a dereference before null check issue discovered by
Coverity (CID 1601566).

The check ad line 1450 suggests that a_priv can be NULL, however it has
been derefenced before, in the interface_to_usbdev() call.

Signed-off-by: Paolo Perego <pperego@suse.de>
---
 drivers/staging/gpib/agilent_82357a/agilent_82357a.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/gpib/agilent_82357a/agilent_82357a.c b/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
index bf05fb4a736b..604e13c32dfb 100644
--- a/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
+++ b/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
@@ -1446,8 +1446,8 @@ static void agilent_82357a_detach(gpib_board_t *board)
 	mutex_lock(&agilent_82357a_hotplug_lock);
 
 	a_priv = board->private_data;
-	usb_dev = interface_to_usbdev(a_priv->bus_interface);
 	if (a_priv) {
+		usb_dev = interface_to_usbdev(a_priv->bus_interface);
 		if (a_priv->bus_interface) {
 			agilent_82357a_go_idle(board);
 			usb_set_intfdata(a_priv->bus_interface, NULL);
-- 
2.47.0