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gefs: advance epoch on task error

it's unlikely anyone has hit this, but we should
remember to advance the epoch if we run into an
error, rather than stalling out.

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

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

@@ -3094,7 +3094,9 @@

 		sleep(5000);

 		if(agetl(&fs->rdonly))

 			continue;

+		epochstart(tid);

 		if(waserror()){

+			epochend(tid);

 			fprint(2, "task error: %s\n", errmsg());

 			continue;

 		}

@@ -3106,7 +3108,6 @@

 		tmnow(&tm, nil);

 		now = tmnorm(&tm);

-		epochstart(tid);

 		for(mnt = agetp(&fs->mounts); mnt != nil; mnt = mnt->next){

 			if(!(mnt->flag & Lmut))

 				continue;

-- 

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