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iostats: remove unused fcallfmt, dont leak our mount pipe end into exportfs proc

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

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

@@ -327,6 +327,7 @@

 		if(chdir(buf) < 0)

 			sysfatal("chdir");

+

 		exec(*argv, argv);

 		if(**argv != '/' && strncmp(*argv, "./", 2) != 0 && strncmp(*argv, "../", 3) != 0)

 			exec(smprint("/bin/%s", *argv), argv);

@@ -354,6 +355,7 @@

 		dup(efd[0], 0);

 		close(efd[0]);

 		close(efd[1]);

+		close(pfd[1]);

 		if(dbg){

 			execl("/bin/exportfs", "exportfs", "-df", dbfile, "-r", "/", nil);

 		} else {

@@ -364,6 +366,8 @@

 	switch(fspid = fork()) {

 	default:

+		close(pfd[1]);

+		close(efd[1]);

 		while(cpid != waitpid())

 			;

 		postnote(PNPROC, fspid, DONESTR);

@@ -376,8 +380,6 @@

 		notify(catcher);

 		break;

 	}

-

-	fmtinstall('F', fcallfmt);

 	stats->rpc[Tversion].name = "version";

 	stats->rpc[Tauth].name = "auth";

-- 

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