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hjfs: fix potential deadlock in putloc()

--- a/sys/src/cmd/hjfs/fs1.c

+++ b/sys/src/cmd/hjfs/fs1.c

@@ -428,11 +428,17 @@

 	while(loop && l != nil && l->ref <= 1){

 freeit:

 		if((l->flags & LGONE) != 0){

+			/*

+			 * safe to unlock here, the file is gone and

+			 * we'r the last reference.

+			 */

+			qunlock(&fs->loctree);

 			b = getbuf(fs->d, l->blk, TDENTRY, 0);

 			if(b != nil){

 				delete(fs, l, b);

 				putbuf(b);

 			}

+			qlock(&fs->loctree);

 		}

 		l->cnext->cprev = l->cprev;

 		l->cprev->cnext = l->cnext;