address shellcheck warnings

cropswap-reply.sh

@@ -12,5 +12,5 @@ fi
 	-A "List-Subscribe: <mailto:$MAILGROUP?subject=[SUBSCRIBE]>" \
 	-A "List-Post: <mailto:$MAILGROUP>" \
 	-A "List-Unsubscribe-Post: List-Unsubscribe=One-Click" \
-	-f$FROM \
-	"${SENDMAIL}" $FROM
+	"-f$FROM" \
+	"${SENDMAIL}" "$FROM"

cropswap-sendmail.sh

@@ -4,7 +4,7 @@ WD=$(mktemp -d)
 cleanup (){
 	rm -rf "${WD}"
 }
-trap cleanup EXIT
+trap 'cleanup' EXIT
 
 cd "${WD}"