qa: Fix codespell error and have lint-spelling error instead of warn

test/lint/lint-spelling.sh

@@ -9,7 +9,10 @@
 
 export LC_ALL=C
 
+EXIT_CODE=0
 IGNORE_WORDS_FILE=test/lint/lint-spelling.ignore-words.txt
 if ! codespell --check-filenames --disable-colors --quiet-level=7 --ignore-words=${IGNORE_WORDS_FILE} $(git ls-files -- ":(exclude)build-aux/m4/" ":(exclude)contrib/seeds/*.txt" ":(exclude)depends/" ":(exclude)doc/release-notes/" ":(exclude)src/leveldb/" ":(exclude)src/qt/locale/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/"); then
     echo "^ Warning: codespell identified likely spelling errors. Any false positives? Add them to the list of ignored words in ${IGNORE_WORDS_FILE}"
+    EXIT_CODE=1
 fi
+exit ${EXIT_CODE}