clk: socfpga: clk-pll: Remove unused variable 'rc'

Fixes the following W=1 kernel build warning(s):

 drivers/clk/socfpga/clk-pll.c: In function ‘__socfpga_pll_init’:
 drivers/clk/socfpga/clk-pll.c:83:6: warning: variable ‘rc’ set but not used [-Wunused-but-set-variable]

Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210120093040.1719407-8-lee.jones@linaro.org
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Lee Jones

drivers/clk/socfpga/clk-pll.c

@@ -80,7 +80,6 @@ static __init struct clk *__socfpga_pll_init(struct device_node *node,
 	const char *parent_name[SOCFPGA_MAX_PARENTS];
 	struct clk_init_data init;
 	struct device_node *clkmgr_np;
-	int rc;
 
 	of_property_read_u32(node, "reg", &reg);
 
@@ -111,7 +110,7 @@ static __init struct clk *__socfpga_pll_init(struct device_node *node,
 		kfree(pll_clk);
 		return NULL;
 	}
-	rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	of_clk_add_provider(node, of_clk_src_simple_get, clk);
 	return clk;
 }