classification: remove useless clear

cppcheck:

src/util-classification-config.c:189:9: warning: Assignment of function parameter has no effect outside the function. Did you forget dereferencing it? [uselessAssignmentPtrArg]
        fd = NULL;
        ^

Bug: #5291.
(cherry picked from commit 9c672a805f)

src/util-classification-config.c

@@ -188,7 +188,6 @@ static void SCClassConfDeInitLocalResources(DetectEngineCtx *de_ctx, FILE *fd)
 {
     if (fd != NULL) {
         fclose(fd);
-        fd = NULL;
     }
 }