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gefs: fix memory leak on nop syncs

when syncing a clean file system, we would leak
the sync messsage; stop doing that.

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

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

@@ -2446,7 +2446,7 @@

 		case AOsync:

 			tracem("syncreq");

 			if(!fs->snap.dirty && !am->halt)

-				continue;

+				goto Next;

 			if(agetl(&fs->rdonly))

 				goto Justhalt;

 			if(waserror()){

@@ -2601,6 +2601,7 @@

 			poperror();

 			break;

 		}

+Next:

 		assert(estacksz() == 0);

 		free(am);

 	}

-- 

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