staging: unisys: Remove useless intialisation

Remove intialisation of a variable that is immediately reassigned.

The semantic patch used to find this is:

// <smpl>
@@
type T;
identifier x;
constant C;
expression e;
@@

T x
- = C
 ;
x = e;
// </smpl>

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorinput/visorinput.c

@@ -255,7 +255,7 @@ register_client_keyboard(void *devdata,  /* opaque on purpose */
 
 {
 	int i, error;
-	struct input_dev *visorinput_dev = NULL;
+	struct input_dev *visorinput_dev;
 
 	visorinput_dev = input_allocate_device();
 	if (!visorinput_dev)