clk: imx: gate2: Remove unused variable ret

This patch fixes below warning reported by coccicheck:

./clk-gate2.c:57:5-8: Unneeded variable: "ret". Return "0" on line 68

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Zou Wei <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

drivers/clk/imx/clk-gate2.c

···
 {
 	struct clk_gate2 *gate = to_clk_gate2(hw);
 	unsigned long flags;
-	int ret = 0;
 
 	spin_lock_irqsave(gate->lock, flags);
 
···
 out:
 	spin_unlock_irqrestore(gate->lock, flags);
 
-	return ret;
+	return 0;
 }
 
 static void clk_gate2_disable(struct clk_hw *hw)