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blk: lock around log chain grafting

--- a/blk.c

+++ b/blk.c

@@ -1116,7 +1116,7 @@

 		rsleep(&fs->syncrz);

 	for(i = 0; i < fs->narena; i++){

 		a = &fs->arenas[i];

-

+		lock(a);

 		if(a->deferhd.addr != -1){

 			chainlog(a->logtl, a->deferhd.addr);

 			loadlog(a, a->deferhd);

@@ -1124,12 +1124,12 @@

 			a->deferhd = (Bptr){-1, -1, -1};

 			a->defertl = nil;

 		}

-

 		finalize(a->logtl);

 		if(syncblk(a->logtl) == -1)

 			sysfatal("sync arena: %r");

 		if(syncarena(a) == -1)

 			sysfatal("sync arena: %r");

+		unlock(a);

 	}

 	qunlock(&fs->synclk);

 }