.gitcheck: continue if no .git (don't break)

the user may have re-downloaded a coreboot tree,
in a release. this is supported. therefore, some
may have .git, and some will not

Signed-off-by: Leah Rowe <leah@libreboot.org>

lbmk

@@ -37,11 +37,12 @@ main()
 	[ $# -lt 1 ] && err "Too few arguments. Try: ${0} help"
 
 	buildpath="./resources/scripts/${0##*/}"
-
 	mode="${1}"
-	./.gitcheck
+
+	./.gitcheck || err "/.gitcheck call from main, in /lbmk"
 	[ "${mode}" = "help" ] && usage ${0} && exit 0
 	[ $# -lt 2 ] && usage ${0} && exit 1
+
 	if [ "${mode}" = "dependencies" ]; then
 		install_dependencies $@ || err "Could not install dependencies"
 		exit 0
@@ -73,7 +74,7 @@ main()
 		"${buildpath}/${mode}/${option}" $@ || err "lbmk error"
 	esac
 
-	./.gitcheck clean
+	./.gitcheck clean || err "/.gitcheck clean call from main, in /lbmk"
 }
 
 install_dependencies()