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gefs: check should take the mutlk, not make the fs readonly

readonly isn't designed to be a temporary state, so things
get a bit unhappy when the fs goes read only

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

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

@@ -190,6 +190,7 @@

 			}

 			r = n;

 		}

+fprint(2, "check arena %d\n", i);

 		if(!checklog(fd, a->loghd))

 			fprint(fd, "arena %d: broken freelist\n", i);

 		qunlock(a);

@@ -260,8 +261,8 @@

 	Blk *b;

 	ok = 1;

-	ainc(&fs->rdonly);

 	epochwait();

+	qlock(&fs->mutlk);

 	if(waserror()){

 		fprint(fd, "error checking %s\n", errmsg());

 		return 0;

@@ -317,7 +318,7 @@

 		poperror();

 	}

 	btexit(&s);

-	adec(&fs->rdonly);

+	qunlock(&fs->mutlk);

 	poperror();

 	return ok;

 }

-- 

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