init.sh: New function dx_ to execute path files

Generated by find, this is a wrapper in place of using
for loops everywhere. This simplification temporarily
increases the amount of code, because we don't do this
a lot, but this will reduce the growth of the build
system code size in future changes.

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

include/git.sh

@@ -54,9 +54,7 @@ git_prep()
 	chkvars rev
 	tmpclone "$1" "$2" "$tmpgit" "$rev" "$_patchdir"
 	if singletree "$project" || [ $# -gt 4 ]; then
-		[ -f "$mdir/module.list" ] && while read -r msrcdir; do
-			fetch_submodule "$msrcdir"
-		done < "$mdir/module.list"; :
+		dx_ fetch_submodule "$mdir/module.list"
 	fi
 
 	[ "$_loc" != "$XBMK_CACHE/repo/$project" ] && \