replicate.sh: Fix error detection with git

bootstrap/replicate.sh

@@ -13,7 +13,7 @@ repo='git@gitlab.com:rehashedsalt/home.git'
 config='git --git-dir="$gitdir" --work-tree="$HOME"'
 
 git clone --recursive --separate-git-dir="$gitdir" "$repo" "$tempfolder"
-if ! $0; then
+if ! $?; then
 	printf "$0: error: failed cloning repository \"$repo\"\n" 1>&2
 	printf "Do you have the appropriate permissions? Does the remote host know your key?\n"
 	exit 2