hvc_console: Drop unnecessary NULL test

The result of container_of should not be NULL.  In particular, in this case
the argument to the enclosing function has passed though INIT_WORK, which
dereferences it, implying that its container cannot be NULL.

A simplified version of the semantic patch that makes this change is as
follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
identifier fn,work,x,fld;
type T;
expression E1,E2;
statement S;
@@

static fn(struct work_struct *work) {
  ... when != work = E1
  x = container_of(work,T,fld)
  ... when != x = E2
- if (x == NULL) S
  ...
}
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

drivers/char/hvc_console.c

@@ -516,8 +516,6 @@ static void hvc_set_winsz(struct work_struct *work)
 	struct winsize ws;
 
 	hp = container_of(work, struct hvc_struct, tty_resize);
-	if (!hp)
-		return;
 
 	spin_lock_irqsave(&hp->lock, hvc_flags);
 	if (!hp->tty) {