[ALSA] Fix use after free in opl3_seq and opl3_oss
Don't read from free'd memory. Also make use of the return value, and don't register the device if something went wrong creating the port. Coverity #954, #955 Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
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