pwm: imx: Remove unreachable code

The break after return is unreachable code, remove it.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/pwm/pwm-imx-util.c b/drivers/pwm/pwm-imx-util.c
index 79d86028..f92c370 100644
--- a/drivers/pwm/pwm-imx-util.c
+++ b/drivers/pwm/pwm-imx-util.c
@@ -21,16 +21,12 @@
 	switch (pwm_id) {
 	case 0:
 		return (struct pwm_regs *)PWM1_BASE_ADDR;
-		break;
 	case 1:
 		return (struct pwm_regs *)PWM2_BASE_ADDR;
-		break;
 	case 2:
 		return (struct pwm_regs *)PWM3_BASE_ADDR;
-		break;
 	case 3:
 		return (struct pwm_regs *)PWM4_BASE_ADDR;
-		break;
 	default:
 		printf("unknown pwm_id: %d\n", pwm_id);
 		break;