clocksource/drivers/stm32: Fix error return code

Return an error code on failure.

Problem found using Coccinelle.

Signed-off-by: Julia Lawall <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Daniel Lezcano <[e-mail]>
Cc: [e-mail]
Cc: Maxime Coquelin <[e-mail]>
Cc: Alexandre Torgue <[e-mail]>
Cc: [e-mail]
Link: https://lkml.kernel.org/[e-mail]

drivers/clocksource/timer-stm32.c

···
 
 	to->private_data = kzalloc(sizeof(struct stm32_timer_private),
 				   GFP_KERNEL);
-	if (!to->private_data)
+	if (!to->private_data) {
+		ret = -ENOMEM;
 		goto deinit;
+	}
 
 	rstc = of_reset_control_get(node, NULL);
 	if (!IS_ERR(rstc)) {