ext4: use swap macro in mext_page_double_lock
Make use of the swap macro and remove unnecessary variable *tmp*. This makes the code easier to read and maintain. This code was detected with the help of Coccinelle. Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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