amdk8: Move to implicit length patching

Change-Id: I8b4c36adaa7ea791ae1a8f7c0d059b9201b08f94
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7332
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
diff --git a/src/mainboard/siemens/sitemp_g1p1/acpi_tables.c b/src/mainboard/siemens/sitemp_g1p1/acpi_tables.c
index a982883..1ff0c5d 100644
--- a/src/mainboard/siemens/sitemp_g1p1/acpi_tables.c
+++ b/src/mainboard/siemens/sitemp_g1p1/acpi_tables.c
@@ -96,14 +96,13 @@
 	global_vars_t *gnvs = cbmem_add (CBMEM_ID_ACPI_GNVS, GLOBAL_VARS_SIZE);
 
 	if (gnvs) {
-		int scopelen;
 		memset(gnvs, 0, sizeof(*gnvs));
 		acpi_write_gvars(gnvs);
 
 		/* Add it to SSDT.  */
-		scopelen = acpigen_write_scope("\\");
-		scopelen += acpigen_write_name_dword("NVSA", (u32) gnvs);
-		acpigen_patch_len(scopelen - 1);
+		acpigen_write_scope("\\");
+		acpigen_write_name_dword("NVSA", (u32) gnvs);
+		acpigen_pop_len();
 	}
 }