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Add a Coccinelle file to identify the dereferences of NULL variables This semantic patch identifies when a variable is known to be NULL after a test, but it is still dereferenced later. Signed-off-by: Nicolas Palix <npalix@diku.dk> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Michal Marek <mmarek@suse.cz>