to ssc just before a return, which is useless since it is a local variable. So, we suggest to delete the test and the two assignments. A simplified version of the semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // @bad_null_test@ expression x,E; @@ x = ssc_request(...) ... when != x = E * x != NULL // Signed-off-by: Julien Brunel Signed-off-by: Julia Lawall Acked-by: Mark Brown Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela ³¼U¬—