reiserfs: cleanup, make hash detection saner
The hash detection code uses long ugly macros multiple times to get the same value. This patch cleans it up to be easier to read. [JK: Fixed up path leak in find_hash_out()] Signed-off-by: NJeff Mahoney <jeffm@suse.com> Signed-off-by: NJan Kara <jack@suse.cz>
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