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devbridge: disable write blocking on ethernets

--- a/sys/src/9/port/devbridge.c

+++ b/sys/src/9/port/devbridge.c

@@ -572,6 +572,8 @@

 		// setup connection to be promiscuous

 		snprint(buf, sizeof(buf), "connect -1");

 		devtab[ctl->type]->write(ctl, buf, strlen(buf), 0);

+		snprint(buf, sizeof(buf), "nonblocking");

+		devtab[ctl->type]->write(ctl, buf, strlen(buf), 0);

 		snprint(buf, sizeof(buf), "promiscuous");

 		devtab[ctl->type]->write(ctl, buf, strlen(buf), 0);

 		snprint(buf, sizeof(buf), "bridge");