clk: sunxi: fix build warning

This patch fix the following build warning:
drivers/clk/sunxi/clk-factors.c:279:14: warning: variable 'name' set but not used [-Wunused-but-set-variable]

Fixes: 4cbeaebb ("clk: sunxi: factors: Add unregister function")
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/sunxi/clk-factors.c

@@ -276,13 +276,11 @@ void sunxi_factors_unregister(struct device_node *node, struct clk *clk)
 {
 	struct clk_hw *hw = __clk_get_hw(clk);
 	struct clk_factors *factors;
-	const char *name;
 
 	if (!hw)
 		return;
 
 	factors = to_clk_factors(hw);
-	name = clk_hw_get_name(hw);
 
 	of_clk_del_provider(node);
 	/* TODO: The composite clock stuff will leak a bit here. */