clk: stm32f4: fix error handling

This is likely that checking 'clks[idx]' instead of 'clks[n]' is
expected here.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/1467526003-13318-1-git-send-email-christophe.jaillet@wanadoo.fr

drivers/clk/clk-stm32f4.c

@@ -364,7 +364,7 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 		    NULL, gd->name, gd->parent_name, gd->flags,
 		    base + gd->offset, gd->bit_idx, 0, &stm32f4_clk_lock);
 
-		if (IS_ERR(clks[n])) {
+		if (IS_ERR(clks[idx])) {
 			pr_err("%s: Unable to register leaf clock %s\n",
 			       np->full_name, gd->name);
 			goto fail;