Input: adi - remove redundant variable z

Variable z is being assigned a value that is never read, the
variable is redundant and can be removed.

Cleans up clang scan build warning:
drivers/input/joystick/adi.c:139:6: warning: Although the
value stored to 'z' is used in the enclosing expression,
the value is never actually read from 'z' [deadcode.DeadStores]

Signed-off-by: Colin Ian King <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/joystick/adi.c

···
 {
 	struct adi *adi = port->adi;
 	struct gameport *gameport = port->gameport;
-	unsigned char u, v, w, x, z;
+	unsigned char u, v, w, x;
 	int t[2], s[2], i;
 	unsigned long flags;
 
···
 	local_irq_save(flags);
 
 	gameport_trigger(gameport);
-	v = z = gameport_read(gameport);
+	v = gameport_read(gameport);
 
 	do {
 		u = v;