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fs: acquire mutation lock around ORCLOSE upsert

only one upsert can go at once.

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

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

@@ -2555,7 +2555,9 @@

 				mb[nm].nv = 0;

 				nm++;

 			}

+			qlock(&fs->mutlk);

 			upsert(am->mnt, mb, nm);

+			qunlock(&fs->mutlk);

 			/* fallthrough */

 		case AOclear:

 			tracem("bgclear");

-- 

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