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fs: hold mutlk when cleaning the snap deadlist

--- a/fs.c

+++ b/fs.c

@@ -153,6 +153,7 @@

 	/*

 	 * Pass 4: clean up the old snap tree's deadlist

 	 */

+	qlock(&fs->mutlk);

 	freedl(&fs->snapdl, 1);

 	fs->snapdl.hd.addr = -1;

 	fs->snapdl.hd.hash = -1;

@@ -161,6 +162,7 @@

 	fs->snapdl.tl.hash = -1;

 	fs->snapdl.tl.gen = -1;

 	fs->snapdl.ins = nil;

+	qunlock(&fs->mutlk);

 	wrbarrier();

 	qunlock(&fs->synclk);

 	poperror();