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upas/fs: restore mistakenly removed nil check

it is needed with some valid combinations of flags.

--- a/sys/src/cmd/upas/fs/fs.c

+++ b/sys/src/cmd/upas/fs/fs.c

@@ -337,8 +337,9 @@

 		mboxfile = mbox;

 	}

-	if(err = newmbox(mboxfile, nil, 0, nil))

-		sysfatal("opening %s: %s", mboxfile, err);

+	if(mboxfile != nil)

+		if(err = newmbox(mboxfile, nil, 0, nil))

+			sysfatal("opening %s: %s", mboxfile, err);

 	switch(rfork(RFFDG|RFPROC|RFNAMEG|RFNOTEG|RFREND)){

 	case -1:

-- 

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