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pc: do not access out of bounds array element

--- a/sys/src/cmd/pc.y

+++ b/sys/src/cmd/pc.y

@@ -636,7 +636,7 @@

 		yylval.sym = getsym(buf, 1);

 		return LSYMB;

 	}

-	if(c < 128 && (kw = optab[c], kw != nil)){

+	if(c >= 0 && c < 128 && (kw = optab[c], kw != nil)){

 		b = Bgetc(in);

 		for(; kw->name[0] == c; kw++)

 			if(kw->name[0] == b)