clk: Remove extraneous 'for' word in comments

An extra 'for' word is grammatically incorrect in the comment
'verifying ops for multi-parent clks'. This commit removes
this extra for word.

Signed-off-by: Rishi Gupta <gupt21@gmail.com>
Link: https://lkml.kernel.org/r/1566023759-7880-1-git-send-email-gupt21@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk.c

@@ -2437,7 +2437,7 @@ static int clk_core_set_parent_nolock(struct clk_core *core,
 	if (core->parent == parent)
 		return 0;
 
-	/* verify ops for for multi-parent clks */
+	/* verify ops for multi-parent clks */
 	if (core->num_parents > 1 && !core->ops->set_parent)
 		return -EPERM;