amd/fam*/northbridge.c: Fix unused hest variable

The variable actually makes to code look a lot better.

TESTED: BUILD_TIMELESS=1 results in identical binaries

Change-Id: Ie9104e4736a3c30b7592bb0e79a8ddc6af579800
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63041
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
diff --git a/src/northbridge/amd/agesa/family15tn/northbridge.c b/src/northbridge/amd/agesa/family15tn/northbridge.c
index 6994781..65be7d8 100644
--- a/src/northbridge/amd/agesa/family15tn/northbridge.c
+++ b/src/northbridge/amd/agesa/family15tn/northbridge.c
@@ -475,9 +475,9 @@
 	/* HEST */
 	current = ALIGN(current, 8);
 	hest = (acpi_hest_t *)current;
-	acpi_write_hest((void *)current, acpi_fill_hest);
-	acpi_add_table(rsdp, (void *)current);
-	current += ((acpi_header_t *)current)->length;
+	acpi_write_hest(hest, acpi_fill_hest);
+	acpi_add_table(rsdp, hest);
+	current += hest->header.length;
 
 	current   = ALIGN(current, 8);
 	printk(BIOS_DEBUG, "ACPI:    * IVRS at %lx\n", current);