Ignore unused structure member check for linenoise

Change-Id: Id7f150d4ac6b5229716c646f970a2a5c14a5ede5

Author: lumynou5

scripts/pre-commit.hook

@@ -44,6 +44,7 @@ cppcheck_suppressions() {
     "preprocessorErrorDirective:random.h"
     "constVariablePointer:linenoise.c"
     "staticFunction:linenoise.c"
+    "unusedStructMember:linenoise.h"
     "nullPointerOutOfMemory:web.c"
     "staticFunction:web.c"
     "constParameterCallback:tools/fmtscan.c"