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fix vim crashing when plumber is not running

	it seems we are receiving plumb events even with the plumber not running.
	This lead to vim crashing because the event is nil and we try to use it anyway.

--- a/os_plan9.c

+++ b/os_plan9.c

@@ -89,6 +89,8 @@

     while(ecanread(plumbkey)){

 	eread(plumbkey, &e);

 	m = e.v;

+	if(m == nil)

+		return;

 	addr = plumblookup(m->attr, "addr");

 	if(addr)

 		l = atoi(addr);

@@ -1058,7 +1060,8 @@

     /* Mouse events must be enabled to receive window resizes. */

     einit(Emouse | Ekeyboard);

     plumbkey = eplumb(512, "edit");

-    start_plumber_thread();

+    if(plumbkey >= 0)

+	    start_plumber_thread();

     scr_inited = TRUE;

 }