USB: gadget: legacy: remove redundant zero assignment to variable 'value'

The variable value is being assigned to zero but that value is never being
read.  Either value is being reassigned in the following if condition, or
it is never read and the function returns. In both cases the assignment is
redundant and can be removed. Cleans up clang warning:

drivers/usb/gadget/legacy/inode.c:1473:4: warning: Value stored to 'value'
is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/legacy/inode.c

@@ -1470,7 +1470,6 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 			dev->setup_wLength = w_length;
 			dev->setup_out_ready = 0;
 			dev->setup_out_error = 0;
-			value = 0;
 
 			/* read DATA stage for OUT right away */
 			if (unlikely (!dev->setup_in && w_length)) {