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

drivers/android/binder_alloc.c

@@ -347,7 +347,7 @@ static void debug_low_async_space_locked(struct binder_alloc *alloc, int pid)
 	 * and at some point we'll catch them in the act. This is more efficient
 	 * than keeping a map per pid.
 	 */
-	struct rb_node *n = alloc->free_buffers.rb_node;
+	struct rb_node *n;
 	struct binder_buffer *buffer;
 	size_t total_alloc_size = 0;
 	size_t num_buffers = 0;