fix some cppcheck warnings

bin/check-all.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# Note: This is a prototype for how we could add static code analysis to the CI.
+
+set -e
+
+VERSION=`bin/buildinfo.py long`
+
+# The shell vars the build tool expects to find
+export APP_VERSION=$VERSION
+
+# only check high and medium in our source
+# TODO: only doing tbeam (to start; add all/more later)
+pio check --flags "-DAPP_VERSION=${APP_VERSION} --suppressions-list=suppressions.txt" -e tbeam --skip-packages --severity=medium --severity=high --pattern="src/"
+return_code=$?
+
+# TODO: not sure why return_code is 0
+echo "return_code:${return_code}"