Bump cppcheck version to 2.8

.github/workflows/build.yml

@@ -129,7 +129,7 @@ jobs:
       CC: gcc
       # This is required to use a version of cppcheck other than that
       # supplied with the operating system
-      CPPCHECK_VER: 2.7
+      CPPCHECK_VER: 2.8
       CPPCHECK_REPO: https://github.com/danmar/cppcheck.git
     steps:
       # This is currently the only way to get a version into

fontdump/fontdump.c

@@ -72,14 +72,18 @@ msg(char *msg1, ...)
 static int
 show_last_error(void)
 {
-    LPVOID lpMsgBuf;
-
-    FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+    LPVOID lpMsgBuf = NULL;
+    DWORD len;
+    len = FormatMessageA(
+              FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
               NULL, GetLastError(),
               MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
               (LPSTR)&lpMsgBuf, 0, NULL);
+    if (len > 0)
+    {
         msg("GetLastError - %s", lpMsgBuf);
         LocalFree(lpMsgBuf);
+    }
     return 0;
 }