Btrfs: Fix wrong error handling code

gcc says "warning: comparison of unsigned expression >= 0 is always
true" because i is an unsigned long. And gcc is right this time.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 64dc93f..a32ebfe 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4104,8 +4104,8 @@ struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len)
 
        return eb;
 err:
-       for (i--; i >= 0; i--)
-               __free_page(eb->pages[i]);
+       for (; i > 0; i--)
+               __free_page(eb->pages[i - 1]);
        __free_extent_buffer(eb);
        return NULL;
 }