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The Coverity checker spotted that if anyone would call this function with 'prev == NULL', he would still get an Oops a few lines below. Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>