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sshnet: reduce memory consumption by lowering stack sizes

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

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

@@ -1250,7 +1250,7 @@

 	pipe(pfd);

 	sshfd = pfd[0];

-	procrfork(startssh, nil, mainstacksize, RFFDG|RFNOTEG|RFNAMEG);

+	procrfork(startssh, nil, 8*1024, RFFDG|RFNOTEG|RFNAMEG);

 	close(pfd[1]);

 	sendmsg(pack(nil, "bsuuu", MSG_CHANNEL_OPEN,

@@ -1317,8 +1317,8 @@

 	fsreqwaitchan = chancreate(sizeof(void*), 0);

 	fsclunkchan = chancreate(sizeof(Fid*), 0);

 	fsclunkwaitchan = chancreate(sizeof(void*), 0);

-	procrfork(fsnetproc, nil, mainstacksize, RFNAMEG|RFNOTEG);

-	procrfork(sshreadproc, nil, mainstacksize, RFNAMEG|RFNOTEG);

+	procrfork(fsnetproc, nil, 8*1024, RFNAMEG|RFNOTEG);

+	procrfork(sshreadproc, nil, 8*1024, RFNAMEG|RFNOTEG);

 	ssh(argc, argv);