USB: mos7840.c: fix a check-after-dereference

This patch fixes an obvious check-after-dereference spotted by the
Coverity checker.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 021be39fe16..5b71962d035 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -2413,11 +2413,12 @@ static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
         }
 
         mos7840_port = mos7840_get_port_private(port);
-        tty = mos7840_port->port->tty;
 
         if (mos7840_port == NULL)
                 return -1;
 
+        tty = mos7840_port->port->tty;
+
         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
 
         switch (cmd) {