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iostats: isolate fs from interrupt notes

interrupt notes go to the child process, not the filesystem
and filter process.

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

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

@@ -300,7 +300,7 @@

 		if(getwd(buf, sizeof(buf)) == 0)

 			sysfatal("no working directory");

-		rfork(RFENVG|RFNAMEG|RFNOTEG);

+		rfork(RFENVG|RFNAMEG);

 		if(mount(pfd[0], -1, "/", mflag, "") < 0)

 			sysfatal("mount /");

@@ -320,6 +320,8 @@

 		close(pfd[0]);

 	}

+	/* isolate us from interrupts */

+	rfork(RFNOTEG);

 	switch(fspid = fork()) {

 	default:

 		while(cpid != waitpid())