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wpa: fix quoting for essid with spaces

--- a/sys/src/cmd/aux/wpa.c

+++ b/sys/src/cmd/aux/wpa.c

@@ -600,7 +600,7 @@

 		sysfatal("dial: %r");

 	if(essid[0] != 0){

-		if(fprint(cfd, "essid %s", essid) < 0)

+		if(fprint(cfd, "essid %q", essid) < 0)

 			sysfatal("write essid: %r");

 	} else {

 		getessid();