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[driver] set tool in and out fds in settool()

We need that for first tool pass as those are initialized to 0.

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

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

@@ -206,8 +206,10 @@

 	if (fdin > -1) {

 		t->in = fdin;

 		fdin = -1;

-	} else if (infile) {

-		addarg(tool, xstrdup(infile));

+	} else {

+		t->in = -1;

+		if (infile)

+			addarg(tool, xstrdup(infile));

 	}

 	if (nexttool < LAST_TOOL) {

@@ -215,6 +217,8 @@

 			die("scc: pipe: %s", strerror(errno));

 		t->out = fds[1];

 		fdin = fds[0];

+	} else {

+		t->out = -1;

 	}

 	addarg(tool, NULL);

@@ -289,8 +293,6 @@

 				free(t->args[i]);

 			t->nargs = t->nparams;

 			t->pid = 0;

-			t->in = -1;

-			t->out = -1;

 		}

 	}