wait_on_state has no error conditions and should return void. Its callers
 already ignore the error code anyway.

Signed-off-by: Jeff Mahoney <je...@suse.com>
---
 fs/btrfs/extent_io.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -621,8 +621,8 @@ search_again:
        goto again;
 }
 
-static int wait_on_state(struct extent_io_tree *tree,
-                        struct extent_state *state)
+static void wait_on_state(struct extent_io_tree *tree,
+                         struct extent_state *state)
                __releases(tree->lock)
                __acquires(tree->lock)
 {
@@ -632,7 +632,6 @@ static int wait_on_state(struct extent_i
        schedule();
        spin_lock(&tree->lock);
        finish_wait(&state->wq, &wait);
-       return 0;
 }
 
 /*


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