drivers/i2c/max98373: fix error message formatting

This adds a missing newline to a printk in the max98373 driver.

BUG=none
TEST=verified BIOS boot log is properly formatted on volteer.

Change-Id: I1c989729bdc71736975901566023e0057a6d0556
Signed-off-by: Caveh Jalali <caveh@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41167
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/drivers/i2c/max98373/max98373.c b/src/drivers/i2c/max98373/max98373.c
index 0557f42..1f8a4f3 100644
--- a/src/drivers/i2c/max98373/max98373.c
+++ b/src/drivers/i2c/max98373/max98373.c
@@ -25,7 +25,7 @@
 	struct acpi_dp *dp;
 
 	if (!dev->enabled || !scope) {
-		printk(BIOS_ERR, "%s: dev not enabled", __func__);
+		printk(BIOS_ERR, "%s: dev not enabled\n", __func__);
 		return;
 	}