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[driver] modify argument number check in addarg()

We only need to reserve args[0]: argv0 and args[NARGS - 1]: NULL

--- a/driver/posix/scc.c

+++ b/driver/posix/scc.c

@@ -140,7 +140,7 @@

 addarg(int tool, char *arg) {

 	struct tool *t = &tools[tool];

-	if (t->nargs >= NARGS - 3) /* 3: argv0, filename, NULL terminator */

+	if (!(t->nargs < NARGS - 2)) /* 2: argv0, NULL terminator */

 		die("scc: too many parameters given");

 	t->args[++t->nargs] = arg;