ec/google: Use EC_HOST_EVENT_NONE

google_chromeec_get_event returns 0 for no event. Return
EC_HOST_EVENT_NONE=0 to improve readability.

BUG=b:184074997
TEST=Build and boot guybrush without error

Signed-off-by: Rob Barnes <robbarnes@google.com>
Change-Id: Ic08ed9ccdd7c0023d0fe8b641fcf60dca495a242
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55547
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/slippy/smihandler.c b/src/mainboard/google/slippy/smihandler.c
index 81fcb0a..16a1b18 100644
--- a/src/mainboard/google/slippy/smihandler.c
+++ b/src/mainboard/google/slippy/smihandler.c
@@ -100,7 +100,8 @@
 	google_chromeec_set_sci_mask(0);
 
 	/* Clear pending events that may trigger immediate wake */
-	while (google_chromeec_get_event() != 0);
+	while (google_chromeec_get_event() != EC_HOST_EVENT_NONE)
+		;
 }
 
 int mainboard_smi_apmc(u8 apmc)
@@ -109,13 +110,15 @@
 	case APM_CNT_ACPI_ENABLE:
 		google_chromeec_set_smi_mask(0);
 		/* Clear all pending events */
-		while (google_chromeec_get_event() != 0);
+		while (google_chromeec_get_event() != EC_HOST_EVENT_NONE)
+			;
 		google_chromeec_set_sci_mask(MAINBOARD_EC_SCI_EVENTS);
 		break;
 	case APM_CNT_ACPI_DISABLE:
 		google_chromeec_set_sci_mask(0);
 		/* Clear all pending events */
-		while (google_chromeec_get_event() != 0);
+		while (google_chromeec_get_event() != EC_HOST_EVENT_NONE)
+			;
 		google_chromeec_set_smi_mask(MAINBOARD_EC_SMI_EVENTS);
 		break;
 	}