binder: remove redundant assignment to pointer n

binder: remove redundant assignment to pointer n

The pointer n is being initialized with a value that is
never read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Acked-by: Todd Kjos <tkjos@google.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200910151221.751464-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>