btrfs: move leaf search logic out of btrfs_search_slot()
There's quite a significant amount of code for doing the key search for a leaf at btrfs_search_slot(), with a couple labels and gotos in it, plus btrfs_search_slot() is already big enough. So move the logic that does the key search on a leaf into a new helper function. This makes it better organized, removing the need for the labels and the gotos, as well as reducing the indentation level and the size of btrfs_search_slot(). Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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