[git-tools] use mktemp in pre-commit (thanks nn-)

git-tools/hooks/pre-commit

@@ -28,13 +28,12 @@ IFS=" "
 for file in $(git diff --cached --name-status $against | grep -v -E '^D' | cut -f2 | grep -E '\.php$')
 do
 	# store lint result in a temp file
-	tempfile="/tmp/$(basename $0).$$.tmp"
+	tempfile=$(mktemp -t "$(basename $0).XXXXXX")
 	if ! php -l "$file" >/dev/null 2>"$tempfile"
 	then
 		error=1
 		cat "$tempfile"
 	fi
-	rm -f "$tempfile"
 done
 unset IFS