fix pve-qemu submodule subhook update

Author: jiangcuo

packages/pve-qemu/autobuild.sh

@@ -10,10 +10,12 @@ errlog(){
 update_submodule(){
 	cd $SH_DIR/$PKGNAME
 	echo "init submodule"
+	git submodule update --init --depth=1 || errlog "submodule update failed"
+	cd $SH_DIR/$PKGNAME/qemu
 	git submodule update --init --depth=1
 	# replace Zeex/subhook
-	echo "set submodule url"
-	cd  qemu/roms/edk2/
+	echo "set submodule url for subhook"
+	cd  $SH_DIR/$PKGNAME/qemu/roms/edk2/
 	git submodule set-url UnitTestFrameworkPkg/Library/SubhookLib/subhook https://github.com/tianocore/edk2-subhook
 	git submodule update --init --recursive --depth=1
 }