uml: avoid NULL dereference in line.c

From: Frank Sorenson <[email protected]>

This patch reorders two lines to check a variable for NULL before using the variable.

---

 linux-2.6.11-paolo/arch/um/drivers/line.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN arch/um/drivers/line.c~uml-reorder_null_check arch/um/drivers/line.c
@@ -593,8 +593,8 @@ irqreturn_t winch_interrupt(int irq, voi
 		}
 	}
 	tty  = winch->tty;
-	line = tty->driver_data;
 	if (tty != NULL) {
+		line = tty->driver_data;
 		chan_window_size(&line->chan_list,
 				 &tty->winsize.ws_row, 
 				 &tty->winsize.ws_col);

_

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