clk: renesas: mstp: Delete unnecessary kfree() in cpg_mstp_clocks_init()

A NULL pointer would be passed to a call of the function kfree()
directly after a call of the function kzalloc() failed at one place.
Remove this superfluous function call.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Link: https://lore.kernel.org/r/e66b822b-026b-29cc-e461-6334aafd1d30@web.deSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/clk-mstp.c

@@ -189,10 +189,8 @@ static void __init cpg_mstp_clocks_init(struct device_node *np)
 	unsigned int i;
 
 	group = kzalloc(struct_size(group, clks, MSTP_MAX_CLOCKS), GFP_KERNEL);
-	if (group == NULL) {
-		kfree(group);
+	if (!group)
 		return;
-	}
 
 	clks = group->clks;
 	spin_lock_init(&group->lock);