ubi: wl: Silence uninitialized variable warning

This condition needs to be fipped around because "err" is uninitialized
when "force" is set.  The Smatch static analysis tool complains and
UBsan will also complain at runtime.

Fixes: 663586c0 ("ubi: Expose the bitrot interface")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/ubi/wl.c

@@ -1517,7 +1517,7 @@ int ubi_bitflip_check(struct ubi_device *ubi, int pnum, int force)
 		mutex_unlock(&ubi->buf_mutex);
 	}
 
-	if (err == UBI_IO_BITFLIPS || force) {
+	if (force || err == UBI_IO_BITFLIPS) {
 		/*
 		 * Okay, bit flip happened, let's figure out what we can do.
 		 */