get.sh: return clone_project if multi-tree

this is the true fix, replacing the fixes previously
reverted.

the problem with the old fix was that it was a hack,
and could result in the archived backup of a code repo
being the wrong one; the destination was the one for
the main repo, but what if we were cloning the backup?

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

include/get.sh

@@ -53,14 +53,13 @@ fetch_project()
 
 clone_project()
 {
-	# if loc is blank, don't create a target
-	# directory; just update the caches
-	loc=""
 	if singletree "$project"; then
 		loc="src/$project"
+
+		if [ -d "$loc" ]; then
+			return 0
 		fi
 
-	if e "$loc" d missing; then
 		remkdir "${tmpgit%/*}"
 		git_prep "$url" "$bkup_url" \
 		    "$xbmkpwd/config/$project/patches" "$loc"
@@ -87,16 +86,7 @@ git_prep()
 		x_ xbmkdir "${_loc%/*}"
 	fi
 
-	if [ -z "$_loc" ]; then
-		# we only used git_prep to update caches, on
-		# a multi-tree project. tmpgit is useless now.
-
-		x_ rm -Rf "$tmpgit"
-	else
-		# actual downloaded
-
 	x_ mv "$tmpgit" "$_loc"
-	fi
 }
 
 fetch_submodule()