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ssh: fix nil dereference when TERM isnt set and -r is requested

--- a/sys/src/cmd/ssh.c

+++ b/sys/src/cmd/ssh.c

@@ -1151,7 +1151,9 @@

 	fmtinstall('k', kfmt);

 	tty.term = getenv("TERM");

-	raw = tty.term != nil && *tty.term != 0;

+	if(tty.term == nil)

+		tty.term = "";

+	raw = *tty.term != 0;

 	ARGBEGIN {

 	case 'd':