fix some lint warnings

Author: lrvideckis

tests/scripts/ptc.sh

@@ -34,8 +34,8 @@ for header in ../library/**/*.hpp; do
 	for i in $(seq "$(wc --lines <"$header")" -5 1); do
 		hash=$(head --lines "$i" "$header" | sed '/^#include/d' | cpp -dD -P -fpreprocessed | ./../library/contest/hash.sh)
 		line_length=$(sed --quiet "${i}p" "$header" | wc --chars)
-		padding_length=$((60 - 8 - $line_length))
-		padding_length=$(( $padding_length > 0 ? $padding_length : 0 ))
+		padding_length=$((60 - 8 - line_length))
+		padding_length=$(( padding_length > 0 ? padding_length : 0 ))
 		padding=$(printf '%*s' "$padding_length")
 		sed --in-place "${i}s/$/$padding\/\/${hash}/" "$header"
 	done