bcache: Sparse fixes

Signed-off-by: Kent Overstreet <koverstreet@google.com>
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index b0a3d05..8c8dfdc 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -563,6 +563,7 @@
 }
 
 static void journal_write_unlocked(struct closure *cl)
+	__releases(c->journal.lock)
 {
 	struct cache_set *c = container_of(cl, struct cache_set, journal.io.cl);
 	struct cache *ca;
@@ -652,6 +653,7 @@
 }
 
 static void __journal_try_write(struct cache_set *c, bool noflush)
+	__releases(c->journal.lock)
 {
 	struct closure *cl = &c->journal.io.cl;