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libdraw: fix mount() error handling in newwindow()

--- a/sys/src/libdraw/newwindow.c

+++ b/sys/src/libdraw/newwindow.c

@@ -25,8 +25,15 @@

 		snprint(buf, sizeof buf, "new %s", str);

 	else

 		strcpy(buf, "new");

-	if(mount(fd, -1, "/mnt/wsys", MREPL, buf) < 0)

-		return mount(fd, -1, "/dev", MBEFORE, buf);

-	return bind("/mnt/wsys", "/dev", MBEFORE);

+	if(mount(fd, -1, "/mnt/wsys", MREPL, buf) == -1){

+		if(mount(fd, -1, "/dev", MBEFORE, buf) == -1){

+			close(fd);

+			return -1;

+		}

+	} else {

+		if(bind("/mnt/wsys", "/dev", MBEFORE) == -1)

+			return -1;

+	}

+	return 0;

 }