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fs: report errors on clear/sync ops

this prevents a nexterror panic, and makes the
file system go read-only when we run into problems.

--- a/fs.c

+++ b/fs.c

@@ -2209,6 +2209,10 @@

 		am = chrecv(fs->admchan);

 		switch(am->op){

 		case AOsync:

+			if(waserror()){

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

+				ainc(&fs->rdonly);

+			}

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

 				a = &fs->arenas[i];

 				qlock(a);

@@ -2254,6 +2258,7 @@

 				postnote(PNGROUP, getpid(), "halted");

 				exits(nil);

 			}

+			poperror();

 			break;

 		case AOsnap:

@@ -2283,6 +2288,10 @@

 			break;

 		case AOclear:

+			if(waserror()){

+				fprint(2, "clear file %llx: %s\n", am->qpath, errmsg());

+				ainc(&fs->rdonly);

+			}

 			for(off = am->off; off < am->length; off += Blksz){

 				qlock(&fs->mutlk);

 				epochstart(id);

@@ -2304,6 +2313,7 @@

 				clunkdent(am->dent);

 			}

 			clunkmount(am->mnt);

+			poperror();

 			break;

 		}

 		assert(estacksz() == 0);